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Posted: 10/10/2012 11:09:47 PM EDT
Well I posed this question in a thread in PSA's industry forum and it was promptly edited away. 
I purchased a PSA M4 upper with the intention of shaving the FSB and building it into a Dissipator-style carbine. I've since seen a few posters note that they've had problems removing the FSB's from their Palmetto State Armory uppers. Has anyone else encountered this? If the FSB is unusually difficult to remove I'll simply shave it while it's on the barrel. |
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If I were you I would just shave it down. It seems like that would be the easiest way to go. Certainly seems like that would be the easiest route. Bringing this project full circle to my original plan of shaving the FSB while still on the barrel, how difficult is it to remove the handguard cap while the FSB is still pinned? |
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If I were you I would just shave it down. It seems like that would be the easiest way to go. Certainly seems like that would be the easiest route. Bringing this project full circle to my original plan of shaving the FSB while still on the barrel, how difficult is it to remove the handguard cap while the FSB is still pinned? You really should remove the FSB in order to get the cap off. I had to cut mine off because I have a 14.5" barrel with pinned flash hider, but I had to slide the FSB out of the way in order to cut through the cap. It will also be much easier to work with off the barrel. I've had to remove taper pins from two FSB's. My Noveske was hard at first becuase I was pounding the taper pins in the wrong direction  . Once I figured it out, they came out pretty easy. The second was a surplus FN barrel. Those were a bitch to remove. Had to fixture the barrel to a piece of plywood directly on the concrete floor and use a 3lb sledgehammer.
I doubt that yours will be this hard to remove though. Just make sure that you pound them in the correct direction, start with a large punch to help slipping off, use a large hammer, and swing hard. |
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The barrels are drilled, and the FSB is installed with taper pins. There isn't any kind of hocus pocus going on that makes them extremely difficult to remove.
Keep in mind that altering or removing the FSB on our uppers voids the warranty. so shaving down the FSB voids the warranty for the whole upper? weak. |
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The barrels are drilled, and the FSB is installed with taper pins. There isn't any kind of hocus pocus going on that makes them extremely difficult to remove.
Keep in mind that altering or removing the FSB on our uppers voids the warranty. Good to hear, thanks for the input. Perfectly reasonable about the warranty. That's why I plan to run the upper through ringer before I take the files and grinders to it.
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I was not having any luck removing the FSB from my PSA upper until I purchased the Brownell's taper pin punch that is made specifically for loosening the pins on the AR15 FSB.
After about 2 good whacks with the punch and my 3-pound ball peen hammer, the pins "cried uncle"  and loosened up very nicely. I had the FSB supported on a bench block too.
louielouie25 p.s. I think the key points are; the right punch, a large hammer, and a solid supporting surface (like the bench block). Oh, and don't be afraid to hit the punch. 
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