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Posted: 4/8/2024 11:13:41 PM EDT
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Because of a soon yo happen move, I need to install a 16” barrel onto my PS90. Anyone know where I can get a 16” barrel? I see FN specialties has them listed but out of stock for their replacement. Any leads would be appreciated. |
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Originally Posted By @weapons_free : idk, i couldnt find a 10.3 in stock when i sbr'd mine so i had the 16" cut down. good luck My go to guys here in AZ say the OEM barrel is too thin to properly cut down.  Even though my PS90 is already SBRed, I thought about cutting the OEM barrel down just to turn it into something useful. |
If the truth makes you uncomfortable, don't blame the truth. Blame the lie that made you comfortable. -James Ng Uni
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Originally Posted By JoshNC: Buy another ps90, leave your SBR as it is and store it in a free state until you leave whatever antigun state you’re about to move to. It’s not a permanent move, it will be 3-4 months off and on for the foreseeable future. Don’t want to buy a second as I don’t want to be leave it stored when I am not there. |
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Originally Posted By JoshNC: Buy another ps90, leave your SBR as it is and store it in a free state until you leave whatever antigun state you’re about to move to.  Why spend that much money when it's just a barrel swap, and it ceases identifying as an SBR as soon as the 16" barrel is installed?
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Originally Posted By 27Katana: It's not a permanent move, it will be 3-4 months off and on for the foreseeable future. Don't want to buy a second as I don't want to be leave it stored when I am not there. |
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Originally Posted By KitBuilder: If you don't want to shoot it while you're in the non-permissive state, you could simply remove the stock and store it separately. It's not a SBR without a stock. Originally Posted By KitBuilder: Originally Posted By 27Katana: It's not a permanent move, it will be 3-4 months off and on for the foreseeable future. Don't want to buy a second as I don't want to be leave it stored when I am not there. It's not an AR. I don't know exactly how the PS90 comes apart, but the stock is integral w/ the entire bullpup firearm outer shell. |
Death to quislings.
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Originally Posted By KitBuilder: If you don't want to shoot it while you're in the non-permissive state, you could simply remove the stock and store it separately. It's not a SBR without a stock. |
If the truth makes you uncomfortable, don't blame the truth. Blame the lie that made you comfortable. -James Ng Uni
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Originally Posted By backbencher: It's not an AR. I don't know exactly how the PS90 comes apart, but the stock is integral w/ the entire bullpup firearm outer shell. It can't shoot without the stock (unlike an AR). |
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Originally Posted By 27Katana: It’s not a permanent move, it will be 3-4 months off and on for the foreseeable future. Don’t want to buy a second as I don’t want to be leave it stored when I am not there. If it’s 3-4 months I would just store it somewhere. That is not enough time to make your plan worthwhile. Seriously. |
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Originally Posted By backbencher: Why spend that much money when it's just a barrel swap, and it ceases identifying as an SBR as soon as the 16" barrel is installed?Because it’s not that simple. It will require a factory flash hider that is blind pinned. Just store it in a permissive state or if he must have a PS90 with him, buy a second gun. The cost of buying a 16” barrel, factory flash hider, having the barrel swapped, then swap it back when he returns to a permissive state will likely end up being around $500, possibly more. It’s a foolish project. Just bring an AR and handgun on this 3-4 month sojourn. |
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Originally Posted By KILLERB6: Who cut down your OEM barrel? My go to guys here in AZ say the OEM barrel is too thin to properly cut down. Even though my PS90 is already SBRed, I thought about cutting the OEM barrel down just to turn it into something useful. i honestly cant remember, ill try looking through my pms |
Silent Brigade 1-20-20
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Originally Posted By JoshNC: Because it’s not that simple. It will require a factory flash hider that is blind pinned. Just store it in a permissive state or if he must have a PS90 with him, buy a second gun. The cost of buying a 16” barrel, factory flash hider, having the barrel swapped, then swap it back when he returns to a permissive state will likely end up being around $500, possibly more. It’s a foolish project. Just bring an AR and handgun on this 3-4 month sojourn. Originally Posted By JoshNC: Originally Posted By backbencher: Why spend that much money when it's just a barrel swap, and it ceases identifying as an SBR as soon as the 16" barrel is installed?Because it’s not that simple. It will require a factory flash hider that is blind pinned. Just store it in a permissive state or if he must have a PS90 with him, buy a second gun. The cost of buying a 16” barrel, factory flash hider, having the barrel swapped, then swap it back when he returns to a permissive state will likely end up being around $500, possibly more. It’s a foolish project. Just bring an AR and handgun on this 3-4 month sojourn. Won't a takeoff barrel come w/ the pinned flash hider? He can't swap the barrel himself? |
Death to quislings.
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Originally Posted By backbencher: Won't a takeoff barrel come w/ the pinned flash hider? He can't swap the barrel himself? i think the issue is when you take off the factory pinned fh off you have to drill the blind pin hole and iirc the gaytf considers that an sbr |
Silent Brigade 1-20-20
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Originally Posted By backbencher: Won't a takeoff barrel come w/ the pinned flash hider? Originally Posted By backbencher: Won't a takeoff barrel come w/ the pinned flash hider? He can't swap the barrel himself? Removing it again can be challenging too. If he knows exactly where the weld penetration is (like on a factory barrel) then it's easy enough to only remove material there. Just depends on what he's able to take on himself. |
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Originally Posted By weapons_free: i think the issue is when you take off the factory pinned fh off you have to drill the blind pin hole and iirc the gaytf considers that an sbr But someone feel free to correct me if that's incorrect. |
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I am still confused. What I'm getting from the recent conversation: 1) PS90 barrels are not removable from the receiver w/o a gunsmith; 2) PS90 takeoff barrels don't come w/ the flashhider already permanently attached, which was the condition they were removed from the gun in. Neither of these statements make any sense to me. |
Death to quislings.
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Originally Posted By backbencher: 1) PS90 barrels are not removable from the receiver w/o a gunsmith; Originally Posted By backbencher: 1) PS90 barrels are not removable from the receiver w/o a gunsmith; here at 1:50  How to: Remove PS90 Barrel Shroud in 2 minutes without stripping threads! where a guy shows you how to remove the blind pin using just a power drill with minimum damage to the shroud. 2) PS90 takeoff barrels don't come w/ the flashhider already permanently attached, which was the condition they were removed from the gun in. Neither of these statements make any sense to me. The shroud additionally acts like the "barrel nut" for the front of the receiver. The barrel screws into the shroud and is then permanently pinned inside of it. Here is another video:  How to remove a barrel shroud from a factory PS90 receiver. #howto |
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Originally Posted By KitBuilder: There's a great YouTube video here at 1:50  https://www.youtube.com/watch?v=g9b8cYjLLJwwhere a guy shows you how to remove the blind pin using just a power drill with the minimum damage to the shroud. The flash hider is always attached to the shroud. I think that's what you're not understanding. It's literally the front of the shroud. The shroud additionally acts like the "barrel nut" for the front of the receiver. The barrel screws into the shroud and is then permanently pinned inside of it. Originally Posted By KitBuilder: Originally Posted By backbencher: 1) PS90 barrels are not removable from the receiver w/o a gunsmith; There's a great YouTube video here at 1:50 https://www.youtube.com/watch?v=g9b8cYjLLJwwhere a guy shows you how to remove the blind pin using just a power drill with the minimum damage to the shroud. 2) PS90 takeoff barrels don't come w/ the flashhider already permanently attached, which was the condition they were removed from the gun in. Neither of these statements make any sense to me. The flash hider is always attached to the shroud. I think that's what you're not understanding. It's literally the front of the shroud. The shroud additionally acts like the "barrel nut" for the front of the receiver. The barrel screws into the shroud and is then permanently pinned inside of it. If I'm understanding you correctly, in order to remove the barrel from the PS90 receiver, you have to drill out a weld? https://www.youtube.com/watch?v=l-KeHK_e9xY Dear God, that is anti-consumer design at its finest.  ETA: And people give HiPoint shit! 
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Death to quislings.
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Originally Posted By backbencher: If I'm understanding you correctly, in order to remove the barrel from the PS90 receiver, you have to drill out a weld? EDIT: It is simply a blind hole with a pin pressed into it. The opposite side just has the wall of the barrel shroud over it and looks indistinguishable from the rest of the shroud's exterior. That's the noticeable tiny spot on a factory shroud (as seen in those 2 videos). However FN did that was approved by ATF. EDIT: The noticeable spot is where the pin was pressed in. The blind pin (without welding) apparently was the ATF-approved method. The hole where the pin was inserted is the only exterior clue on the barrel shroud. When normal people re-attach a 16" barrel shroud, they'll probably have to weld (if they want to return to permanent attachment in meeting the 26" OAL requirement). Edited for correction. It's been about 15 years since I've removed one of these. 
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Originally Posted By KitBuilder: I'm not certain if the attachment method it ships with from the FN factory is "a weld" but they've got some of the steel that makes up the barrel shroud protruding into that pin hole in the barrel, underneath that exact spot on the shroud, and that's what you've got to remove in order to tap that pin out. That's the noticeable tiny spot on a factory shroud (as seen in those 2 videos). However FN did that was approved by ATF. When normal people re-attach a 16" barrel shroud, they'll probably have to weld. Originally Posted By KitBuilder: Originally Posted By backbencher: If I'm understanding you correctly, in order to remove the barrel from the PS90 receiver, you have to drill out a weld? That's the noticeable tiny spot on a factory shroud (as seen in those 2 videos). However FN did that was approved by ATF. When normal people re-attach a 16" barrel shroud, they'll probably have to weld. I've been 5.7 "curious" for some time, even built my own AR 5.7 Lyndon, but never realized the PS90 was that bad to get apart. I thought the P90 barrel reciprocated a bit with the bolt? Not in the PS90? |
Death to quislings.
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Originally Posted By backbencher: I thought the P90 barrel reciprocated a bit with the bolt? Not in the PS90? In both models, the barrel doesn't move relative to the "nut" that holds it. (The "nut" being the barrel shroud on the PS90, and the "nut" of the P90 being the flash suppressor). It's a threaded assembly with the receiver sandwiched in between. If you grasp either model's barrel assembly, they'll both move relative to the receiver. |
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Originally Posted By backbencher: Dear God, that is anti-consumer design at its finest. ETA: And people give HiPoint shit! FN basically had to wait for the AWB to sunset before even attempting to offer a semi-auto version in the US. I think they did the best they could. It's still relatively simple to SBR one and end up with something that looks and handles exactly like a P90. Really this is the fault of the US government and their stupid NFA/GCA laws. At least FN noted the location on the shroud for you to attack it with tools.  |
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Originally Posted By KitBuilder: They're both supposed to have the same amount of play in them. In both models, the barrel doesn't move relative to the "nut" that holds it. (The "nut" being the barrel shroud on the PS90, and the "nut" of the P90 being the flash suppressor). It's a threaded assembly with the receiver sandwiched in between. If you grasp either model's barrel assembly, they'll both move relative to the receiver. Originally Posted By KitBuilder: Originally Posted By backbencher: I thought the P90 barrel reciprocated a bit with the bolt? Not in the PS90? In both models, the barrel doesn't move relative to the "nut" that holds it. (The "nut" being the barrel shroud on the PS90, and the "nut" of the P90 being the flash suppressor). It's a threaded assembly with the receiver sandwiched in between. If you grasp either model's barrel assembly, they'll both move relative to the receiver. Thanks for the explanation. Had no idea OP's problem was so complex. Can the PS90 fire with the shell removed? |
Death to quislings.
| You will need more than the barrel. IIRC from when I SBR'd mine, you also need the shroud and pin. The barrel threads into the shroud which also has the flash hider. I drilled a hole to knock the pin out, so jt kept everything intact in case I need to return to 16" like the OP. It was a relatively simple procedure with just hand tools. |
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Originally Posted By KitBuilder: Which shell? The barrel shroud? I mean yeah, technically it can, at least once lol, but that's a terrible idea. Originally Posted By KitBuilder: Originally Posted By backbencher: Can the PS90 fire with the shell removed? Which shell? The barrel shroud? I mean yeah, technically it can, at least once lol, but that's a terrible idea. This video was a good introduction to how it field strips, a couple of features I didn't know about, and a reminder that it's fully ambidextrous:  FN PS90 Features & Disassembly! If I ever do get back into 5.7, I might have to get one of these for my Sinister. It would seem the whole P/W flash hider silliness could be avoided w/ an 18" barrel, which would give even better ballistics to a marginal round. It also looks as if it would be fairly easy to 3-D print a chassis with alternate ergos and features, as well as mill a wooden chassis. Is there an aftermarket metal FCG, &/or improved triggers? |
Death to quislings.
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Originally Posted By Hater: @seantx An angle grinder killed my factory barrel when the 10.3 went on. If this is a temporary thing and you don't plan on using it, I can send you the stub of a barrel I have. If you can get someone to weld on a ghetto shroud you will be legal. |
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Originally Posted By KILLERB6: Who cut down your OEM barrel? My go to guys here in AZ say the OEM barrel is too thin to properly cut down. Even though my PS90 is already SBRed, I thought about cutting the OEM barrel down just to turn it into something useful. Your “go to” guys are MORONS! TROS has LITERALLY cut down and threaded over a Thousand factory PS90 Barrels I should have a factory PS90 unmolested barrels somewhere. |
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Originally Posted By PursuitSS: Your “go to” guys are MORONS! TROS has LITERALLY cut down and threaded over a Thousand factory PS90 Barrels I should have a factory PS90 unmolested barrels somewhere. |
If the truth makes you uncomfortable, don't blame the truth. Blame the lie that made you comfortable. -James Ng Uni
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Originally Posted By backbencher: I've been 5.7 "curious" for some time, even built my own AR 5.7 Lyndon, but never realized the PS90 was that bad to get apart. I thought the P90 barrel reciprocated a bit with the bolt? Not in the PS90? It’s super easy to get a PS90 barrel off to have it cut down to an SBR. A hacksaw does the job just fine and then you send it to someone who can finish it at the proper length. The reverse operation is the difficult part. |
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Originally Posted By vellnueve: Mine was like a week When I checked several years ago…it was a long time. Same with his trilug 9mm AR barrels. |
If the truth makes you uncomfortable, don't blame the truth. Blame the lie that made you comfortable. -James Ng Uni
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