Fn ps90 owners manual

It's purpose for the p90 is to control reduce? Not sure what it does for a semi-auto system except maybe reduce recoil a bit? Quoted: Not sure what it does for a semi-auto system except maybe reduce recoil a bit? Quoted: I have it on good authority that that weight which is part of the 'moving parts group' seriously, that's it's name is the same for the p90 as it is for the ps Quoted: With "Hot" loads it keeps the magazine from popping up.

In fact, Elite Ammunition sells a heavier weight to further alleviate the issue. Seems to be unavailable however. Quoted: Because the reduced weight resulting from its removal increases bolt velocity, right? But why would anyone remove it in the first place? Or is mag popping still a problem with the standard weight when using certain ammo?

Does said ammo perform extra awesome? There's actually I guy on one of the FB who has mag popping suppressed or unsuppressed shooting factory ammo. He has like K through the gun and it only started doing it. We speculate the stock may be to blame, but not sure. I am not sure if the weight is helping or hurting as another 5. When the controversy started about the "Auto Sear" everyone was calling it a "Safety Sear" because FN left it in for supposedly safety reasons.

Honestly I haven't kept up with the issue so I didn't know it was vogue to call it what it is "Auto Sear" now. That's why I thought the trigger packs has been neutered by FN. View Quote I thought they also neutered the "sear trip" surface of the bolt on the later latest? I thought they also neutered the "sear trip" surface of the bolt on the later latest? On the bolt? That's still required to move the sear out of the way so the hammer can fully fall.

Ok good. The PS90 bolt with gen 3 trigger pack has the anti-bounce weight. He was legally able to buy the full auto trigger pack The modifications required were the new safety to allow the trigger to go fully rearward. And the trigger pack needed a small piece cut out because the PS90 receiver has a little tab to prevent the FA trigger pack from being installed.

That horizontal cutout can be seen in OP's 1st pic on the left side of the pack. I've read some about different trigger packs between generations, but not enough to know what to look for if it's worth it.

Is the latest generation just as good as any other? Shop around or just fo? Next step would be Form 1 and barrel chop, plus 50rd mags. The early models had a safety sear that kept them from firing out of battery. They ALL still have the safety sear! The main difference between trigger packs is how easy they are to modify to something illegal.

The Gen 4 trigger pack was supposed to eliminate the front safety sear but they have never released one. Quote History. Quoted: They ALL still have the safety sear! I just bought one local to me this week. Remove the maintenance lubricant from the moving parts group [ 3]. Slightly lubricate the moving parts group [ 3 ] by proceeding as follows : - Apply 2 drops of functional lubricant to each breech block assembly guide rod C2 , just behind the breech block assembly Apply 1 drop of f unctional lubri cant to the ejector , to the extractor and to the holes of the breech block assembly The other ports of the submochine gun do not require lubrication.

The P90 submochine gun only requires minimal lubrication. Excessive lubrication of the weapon or the presence of a l ubricant i nside the magazine [ 5 ] will have on unfavourable effect on the rel iabil ity of the weapon and the longevity of its parts.

When the barrel is clean, again use a piece of flannel, this time moistened with maintenance lubricant, to protect the inside of the barrel until the next use. Please note that the inside of the barrel J 31 should be wiped dry before shooting also refer to 8. If necessary, use water or a soft solvent. If necessary, use water. If the magazine is very soiled, disassemble it and then clean its parts by using water. Never use any kind of solvent on the magazine [ 5 ].

Components of the magazine [ 5 ] may never be lubricated : the presence of a lubricant inside the magazine could cause malfunctions. Reassemble t he gun. Disassembly ' Remove the barrel and optical sight group [ 1 ] as described in 7. NOTE : In order to faci litate the disassembly of the barrel and optical sight group [ 1 ], it is recommended to f ix it upside down into a vice.

Fit the socket of the wrench OREA onto the 2 flat faces on the rear end of the barrel 7 3 7. Completely unscrew the barrel from the flash-hider Rg. While unscrewing the barrel with one hand, hold the flash-hider with the other one. Whi le pushing on the barrel support lock , carefully pull the barrel out of t he rear end of the barrel support body until the front end of the barrel is aligned with the rear edge x of the front opening in the cocking handle Rg.

During this step, hold the cocking handle 1 50 in position with the hand used to push on the barrel support lock 7 Disassembly continued Still holding the cocking handle with one hand and working through the front opening o of the cocking handle, carefully toke the cocking handle return spring by its front extremity out of the barrel support body Fig.

When removing the cocking handle return spring 1 35 , toke into account that the spring is subieded to much tension. Lift the cocking handle up and off the barrel support body Fig. While pushing on the barrel support lock , remove the barrel by pulling it completely out of the rear end of the barrel support body Once the barrel 1 31 has been removed, the barrel support lock and its spring 1 25 ore released :toke them out of the barrel support body Fig.

If required, use the plastic mal let UT to remove the 2 cocking handle studs 1 55 from the cocking handle body A 1 Fig. Disassembly continued The following 2 steps should only be carried out if it is absolutely necessary to intervene on t he optical sight Toke into account that it will be necessary to readjust the sight after it has been reassembled and reinstalled.

If the some sight will be used ogoin, ond in order to ovoid the necessity of o readjustment, it is also possible to mark the position of the adjustment screws a small mark of 1 - 2 mm is enough before taking them out. If necessary, use the sight adjustment spanner OREA to remove the 2 sight adjustment screws from the optical sight body A2 Fig. If it is necessary to remove the triti um light source , the normal radiation hazard procedures should be carried out.

Also ensure to be familiar with the safety information especially applying to the tritium light source refer to 4. If necessary, remove t he tritium light source out of the optical sight body A2 by cutting away the protective silicone rubber sealing and then taking out t he trit ium light source Fig. Be extremely careful not to damage the light wedge of the optical sight! Reassembly If it is necessary to handle the tritium light source , the normal radiation hazard procedures should be carried out.

Also ensure to be fami liar with the safety information especially applying to the tritium light source refer to 4. If the tritium li ght source 7 14 has been removed, reinstall a new one by proceeding as follows: - Insert the tritium light source , with its painted side facing upwards, into its opening in the optical sight body A2.

This ensures that there will only be o thin foyer of silicone rubber between the tritium light source 7 14 and the light wedge. If necessary, and as long os the silicone rubber has not hardened, gently change the position of the tritium light source in order to optimize the open T-illuminotion of the optical sight. Let the silicone rubber harden for at least 48 hours.

If the 2 sight adjustment screws have been removed, screw them bock into position by using the sight adjustment spanner OREA Fi g. If the some sight is used again and small marks have been mode, use these marks to ensure that the screws ore screwed bock into their original position.

If the optical sight has been removed from the barrel support body 1 21 , fit it back into position and then fix it with the 2 hexagonal socket head screws fig. Use the hexagonal wrench OREA to correctly secure the 2 hexagonal socket head screws Reassembly continued NOTE : In order to facili tate the reassembly of the barrel and optical sight group [ 1 ], it is recommended to fix the barrel support body 12 1 upside down into a vice. If the 2 cocking handle studs have been removed, install new ones onto the extremiti es of the cocking handle body A 1 by using the plastic mallet UT 21 01 fig.

Insert the barrel support lock spring and the barrel support lock into their hole in the barrel support body and then hold them in position with a finger lfg. While pushing down on the barrel support lock so that its hole is aligned with the barrel housing in the barrel support body , insert the barrel into the rear end of the barrel support body until it is positioned as shown in Fig.

After this operation, the barrel support lock is held into position by the barrel so that the finger con be removed. Place the cocking handle back onto the barrel support body Fig. Reassembly continued While holding the cocking handle with one hand and working through the front opening o of the cocking handle, caref ully reinstal l the cocking handle return spring onto the barrel Fig. Take into account that some force will be required to reinstall the cocking handle return spring completely into its housing in the barrel support body Sti ll holding the cocking handle with one hand and while pushing on the barrel support lock , careful ly push the barrel , through the cocking handle return spring , all the way into the barrel support body 1 Ensure that the threaded end of the barrel comes out at the front side of the barrel support body Fi t the barrel return spring over the threaded front end of the barrel and then manually screw the flash-hider back onto the barrel fig.

Do not screw the flash-hider more than 3 turns : ;ust ensure that it cannot fall off the barrel 13 1. Orientate the flash-hider so that the flat face on its rear collar is perfectly aligned with the flat surface of the barrel support body While pushing the flash-hider rearwards with one hand, tighten the barrel 13 1 with the other hand as far as possible in the counterclockwise direction fig.

Ensure that the flat face on the rear collar of the flash-hider correctly slides along the flat surface of the barrel support body Reinstall the barrel and optical sight group [ 1 J as described in 7. If, during the previous disassembly and reassembly procedure, there has been an intervention on the optical sight 71 1 , it should be re-adjusted refer to 1 0. The sight should also be adjusted after disassembly and reassembly of the barrel or the flash-hider , even if they are not replaced by new ones.

Disassembly Remove the barrel and support group [ 1 J as described in 7. NOTE : In order to facilitate the disassembly of the barrel and support group [ 1 ], it is recommended to fix it upside down into a vice.

Fit the socket of the wrench OREA onto the 2 flot foces on the rear end of the barrel 1 Compl etely unscrew the barrel from the flash-hider 1 65 Rg. While pushing on the barrel support lock , carefully pull the barrel out of the rear end of the barrel support body until the front end of the barrel is al igned with the rear edge x of the front opening i n the cocking handle Rg. During this step, hold the cocking handle in position with the hand used to push on the barrel support lock Disassembly continued Stil l holding the cocking handle wi th one hand and worki ng through the front opening o of t he cocking handle, carefully toke the cocking handle return spri ng by its front extremity out of the barrel support body 12 1 Fi g.

When removing the cocking handle return spring , take into account that the spring is subjected to much tension. Lift the cocking handl e up and off the barrel support body Rg. While pushing on t he barrel support lock , remove the barrel 1 31 by pulling it completely out of the rear end of the barrel support body Once the barrel 13 1 has been removed, the barrel support lock and its spring are released : toke them out of the barrel support body Fig.

If required, use the plastic mall et UT to remove the 2 cocking handle studs 1 55 from the cocking handle body A1 Fig. NOTE : Once t hey have been removed, the cocking handle studs must always be replaced by new ones! UT "-, Fig. Reassembly If one or both side rails 94 1 have been removed from the barrel support body 1 21 , fit it them back into position and then fix it them with the hexagonal socket head screw s Fig.

Use the hexagonal wrench UT to correctly secure the hexagonal socket head screw s NOTE : In order to facilitate the reassembly of the barrel and support group [ 1 ], it is recommended to fix the barrel support body 1 21 upside down into a vice. If the 2 cocking handle studs have been removed, install new ones onto the extremities of the cocking handle body A1 by using t he plastic mall et UT fig.

Insert the barrel support lock spring and the barrel support lock into their hole in the barrel support body and then hold them in position wi th a f inger ffg.

While pushing down on the barrel support lock so that its hole is aligned with the barrel housing in the barrel support body , insert the barrel into the rear end of the barrel support body unti l it is positioned as shown in fig. Place the cocking handle back onto the barrel support body 12 1 fig. Reassembly continued While holdi ng the cocking handle with one hand and working through the front opening o of the cocki ng handle, carefully reinstall the cocki ng handle return spring onto the barrel Fig.

Still holding the cocking handle with one hand and while pushing on the barrel support lock , carefully push the barrel , through the cocking handle return spring , all the way into the barrel support body Fit the barrel return spring over the threaded front end of the barrel and then manually screw the flash-hider bock onto the barrel Rg.

Do not screw the flash-hider more than 3 turns : iust ensure that it con not fall off the barrel While pushing the flash-hider rearwards with one hand, tighten the barrel with the other hand as for as possibl e in the counterclockwise direction fig. Reinstall the barrel and support group [ 1 ] as described in 7.

Disassembly Completely disassemble the submachine gun as described in 7. Note that, during the field stripping procedure, the butt plate has already been removed from the frame Fig. Using the screwdriver UT , from underneath, through the ejection opening unlock the magazine catch assembly 81 by pushing on its latch Fig. As a result, the magazine catch assembly B 1 pops out of the frame by opprox. Take the magazine catch assembly B 1 out of the frame Firmly push onto t he magazine catch guide and t hen raise it in order to release it, together with the magazine catch spring , f rom the magazine catch Fig.

When carrying out this step, take into account that the magazine catch spring is subjected to much tension. Using the screwdriver UT , carefully release the operating rod from the trigger assembly B2 and f rom the frame Fig. Take the operating rod out of the frame UT ""' 82 Fig. Disassembly continued Set the fi re selector at the position 'PI full -automatic or ' 1' si ngle-shot. Using the screwdriver UT , move the trigger stop slightly forwards so that its front extremity is released and can be pivoted out of its slot in the frame Rg.

Pivot the front extremity of the trigger stop out of its slot and then use it to remove the trigger assembl y 82 out of the frame Fig. If necessary, carefully separate the trigger stop from the trigger Rg. Set the fire selector at the position ' 1' single-shot. Carefully remove the fi re selector by moving it slightly forwards and then l ifting it up and off the frame Fig. Whi le holding an extremity of the fire selector spring in position with the screwdriver UT , careful ly release the corresponding fi re selector plunger from the spri ng by using the pliers UT 0 Fig.

Remove the fire selector spring and then careful ly release the remaining fi re sel ector plunger from the spring Fig. Repeat the previous operation at the left side on the bushing in order to completely release the obturator assembly Take the obturator assembly B3 out of the frame Disassemble the obturator assembly B3 by proceeding as follows Fig. Sli de the obturator catch off the obturator body At the front extremity of the frame , take out the 3 hexagonal socket head screws which secure the laser unit c Fig.

Taking into account that they are not al l the same, and therefore not interchangeable, take out the 1 0 hexagonal socket head screws 2 x , 4 x , 1 x , 1 x and 2 x out of the 1 0 identical hexagonal nuts Fig. When carrying out the next step, be careful not to lose the 3 washers 1 x and 2 x Separate the left and right frame plates and then carefully remove t he laser assembly 84 consisting of the battery holder a , the " laser ON" button b and t he laser unit c Fig.

Ensure that the cables of the loser assembly 84 will not be trapped when reassembling the 2 frame plates Reassemble the left and right frame plates Fig. Do not forget to reinstall the 3 washers 1 x and 2 x while orienting them as shown in Fig. Screw the 10 hexagonal socket head screws 2 x , 4 x , 1 x , 1 x and 2 x back into the 10 hexagonal nuts Fig.

At the front extremity of the frame , secure the laser unit c by using the 3 hexagonal socket head screws Fig. Do not fully tighten the screws as they will be used for the odiustment of the loser unit c.

Also toke into account that excessive tightening of the screws con cause irreversible damage to the loser unit c. Proceed to 9. After its reinstallation, the laser unit c of the laser assembly 84 should be readjusted refer to 1 0.

Reassembly Reassemble the obturator assembly 83 by proceeding as follows Fig. The obturator catch can only be fitted into position if its protruding part is at the right, rear side.

Ensure that the obturator catch correctly engages the slot of the obturator body Place the obturator return spring at its correct location on the obturator body and hold it in position with a finger The obturator return spring should be positioned so that its shorter extremity is at the left side.

While pushing the bushing and the obturator axis towards each other in order to compress the obturator return spring , fit the obturator assembly 83 , from underneath, through the ejection opening inside the frame Fig.

Push the obturator assembly 83 further upwards until it locks into position. The bushing and the obturator axis should correctly engage the corresponding holes in the frame two clicks should be heared. Check if the oburator assembly 83 is fi rmly held in place. Turn the frame upside down and t hen, using the screwdriver UT , hook the short extremity of the obturator return spri ng onto its support s which can be found inside the frame Fig.

Reassembly continued Fit a fire selector plunger onto one of the extremities of the f ire selector spring Fig. Insert the fire selector spring into its housing in the frame While holding the f ree extremity of the fire selector spring 25 1 in position with the screwdriver UT , carefully fit the remaining fire selector plunger onto the spring by using the pliers UT Rg. Re-install the fire selector Fig. During this operation, hold the fire selector orientated as if it was at the position '1' single- shot.

When fitting the fire selector back info position, first move if slightly sidewards so that if engages one of the 2 fire selector plungers After that, use the screwdriver UT to push the other fire selector plunger into position underneath the fire selector Finally, ensure that the fire selector fits correctly info position a click should be heared.

If they have been separated, carefully fit the trigger stop back into the trigger Fig. Reinsert the trigger assembly B2 into its housing in the frame Fig. During this operation, hold the trigger assembly 82 by the front extremity of the trigger stop After having inserted the trigger assembly 82 into the frame , move it slightly rearwards in order to ensure that it is correctly positioned. When lowering the front extremity of the trigger stop offer this operation, ensure that it correctly engages its slot in the frame Using the screwdriver UT , move the trigger stop slightly rearwards so that it locks into position into its slot in the frame Fig.

Reassembly continued Reinstall the operating rod by proceedi ng as follows Rg. Reassemble the magazine catch assembly B 1 by proceeding as follows Fig. Install the magazine catch assembly B 1 , with its opened part facing upwards, back into the frame Fig. Ensure that the magazine catch assembly B 1 engages correctly : a click should be heared. If necessary, use the screwdriver UT , from underneath, through the ejection opening, to press on the latch of the magazine catch assembly B 1 in order to assist the assembly to engage properly.

After this operation, check if the magazine catch assembly 8 1 con smoothly move bock and forth. Reassemble the submachine gun as described in 7. Disassembly Remove the moving parts group [ 3 I as described in 7. Pull the breech block assembly rearwards along its guide rods C2 and then hold the moving parts group [ 3 I in that condition i n one hand. During this step, which is required in order to be able to carry out the following one, the return springs are compressed.

Usi ng the scraper UT , remove the 2 snap rings Fig. NOTE : Once they hove been removed, the snap rings 4 79 must always be replaced by new ones! Gently release the pressure on the return springs 4 77 and then slide the breech block assembly , the rote-of-fire stabilizer 48 1 and the 2 return springs 4 77 off the 2 guide rods of the guide assembly fig. Disassemble the guide assembly 4 70 by separating the 2 guide rods C2 from the breech block assembly stop block Fig.

Disassembly continued Cl Disassemble the breech block assembly by proceeding as follows : - Using the drift punch UT and the hammer UT 21 10, drive out the spring pin which secures the firing pin Fig. In order to facilitate the driving-out of the spring pin , push the firing pin slightly into the breech block C 1 ond hold it in that position with a finger. After having driven out the spring pin , gently release the firing pin During this operation, hold the extractor spring in position with a finger.

Remove the extractor spring During this operation, hold the eiedor in position with o finger. Reassembly Insert the ejector spring and then the ejector back into their hole at the front side of the breech block C1 Fig. The ejector should be inserted with its smaller end first pointing towards the rear side. Reinstall the spiral pin , which secures the ejector and its spring 44 1 , by proceeding as follows Fig.

Position the spiral pin against the drift punch UT and then, using the hammer UT , drive t he spiral pin fully home, allowing it to push out the drift punch UT Reinstall the extractor by proceeding as follows Fig. Fit the spring pin onto the drift punch UT Reinstall the extractor spring 43 1 by proceeding as follows Fig. Reassembly continued Insert the firing pin into its spring and then insert this assembly bock into the corresponding hole at t he rear side of the breech block C1 Fig.

Reinstall the spring pin , which secures the firing pin and its spring , by proceeding as follows Fig. Using the snap ri ng installation tool OREA , install 2 new snap rings into the grooves of the guide rods C2 Fig. Gently release the breech block assembly Ensvre that the breech block assembly is correctly held bock by the 2 snap rings Rei nstall the moving ports group [ 3] as described in 7.

However, disassembling the hammer group [ 4 ] is relatively si mple as it involves the progressive removal of the 5 parallel pins 1 to 5 on Fig. On the other hand, reassembly is more complicated and should be carried out very carefully. Before disassembling the hammer group [ 4 ], ensure to understand its operation.

It is also recommended to use a spore hammer group as reference during reassembly. Disassembly Remove t he hammer group [ 4] as described in 7. Using the drift punch UT and the hammer UT from the right side, drive out the parallel pin 1 Fig.

When removing the drift punch UT , hold the outomotic seor 51 9 in position with o finger. Remove the automatic sear Fig. Using the drift punch UT and the hammer UT from the right side, drive out the parallel pin 2 Fig.

When removing the drift punch UT , hold the hammer in position with o finger. Disassembly continued Using the drift punch UT from the right side, push out the parallel pin 3 Fig. When removing the drift punch UT , hold the front sear in position with a finger. Remove the front sear Fig. Usi ng the drift punch UT from the right side, push out the parallel pin 4 Fig.

When removing the drift punch UT , hold the rear sear and its spring in position with a finger. Remove the rear sear and its spring Fig.

Using the drift punch UT from t he right side, push out the parallel pin 5 just far enough to release the hammer group lock assembly D 1 Fig. Do not push the parallel pin 5 out further as necessary: ensure that the safety sear , which is held by the some pin, is not released yet. When removing the drift punch UT , hold the hammer group lock assembly D 1 in position with a finger. Remove the hammer group lock assembl y D1 together with its spring Fig. If necessary, separate the hammer group release lever from the hammer group lock Fig.

Using the drift punch UT from the right side, completely push out t he parallel pin 55 1 5 Fig. When removing the drift punch UT , hold the safety sear 54 1 in position with a finger. Take the safety sear out of the hammer group body Fig.

Using the pliers UT 0, caref ully compress the rear extremities of the safety sear spring towards the inside in order to release them from their holes inside the hammer group body and then take the spring out of the hammer group body Fig. Be careful not to damage the extremities of the safety sear spring when releasing them from their holes inside the hammer group body 5 Reassembly Reassembli ng the hammer group [ 4 ] is rather complex and should be carried out very carefully.

It is recommended to use a spare hammer group as reference duri ng reassembly. The 5 parallel pi ns 55 1 of the hammer group [ 4 ] are identical and can be interchanged. Using the pliers UT , carefully reinstall the safety sear spring into position inside the hammer group body 5 11 Fig. Ensure that the safety sear spring is correctly oriented and thot its two extremities fit correctly into the corresponding holes inside the hammer group body 51 I.

Do not reinstall the safety sear spring upside down! Place the safety sear back inside the hammer group body 51 1 Fig. Ensure that the safety sear is correctly oriented and that its front port is correctly placed onto the safety seor spring Secure the safety sear 54 1 into position by proceeding as foll ows Fig. If they have been separated from each other, fit the hammer group release lever back into the hammer group lock Fig.

Insert the hammer group lock spring and then the hammer group lock assembly D1 into their housing in t he hammer group body 5 11 Fig. Ensure that the hammer group lock assembly D I is correctly oriented. While pushing the hammer group lock assembly D 1 with a f inger f ully into the hammer group body 51 1 , push the paral lel pin 55 1 5 fully home. After this operation, gently release the hammer group lock assembly D I and check if it is correctly held bock by the parallel pin 5.

Reassembly continued Reinstall the rear sear and its spring by proceeding as follows Fig. Ensure that the open, rear part of the rear sear is correctly positioned over the front part of the safety sear 54 1.

The longer extremity L of the rear sear spring should poss under the parallel pin 55 7 5 and then fit into its housing at the rear side of the hammer group body 5 7 7 also refer to the right port of Fig. The coils of the rear seor spring should be aligned with the part of the parallel pin 55 7 4 protruding inside the rear sear