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Posted: 10/9/2011 5:39:34 AM EDT
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I have a PSA 16" carbine upper and I am looking to put either a Samson Evo or Troy TRX rail on it. My question is with the low-pro FSB. I really have no idea what brand is good and what type (screw on or pins) to go with. My barrel is a LW profile too, if that matters. Any help anyone could give would be greatly appreciated.
Thanks, broham |
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Quoted:
Quoted:
Grind down your current FSB into a low profile. ^^This. All gas blocks function the same. All your gonna be paying for it looks, and name. Unless one day you want to put it back to stock and have to pay someone to mount up a new FSB. Yankee hill makes one which is one of the smallest ones out, it's affordable and works just as well as the more expensive ones. http://yhm.net/index.php?main_page=product_info&cPath=2_6&products_id=40 |
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Alright so assuming I was just gonna cut down my original FSB, how would I go about doing that? I tried to search it but came up empty. I do see the point of using an aftermarfet and keeping the original for a later date, but I seriously doubt I will go back to the original FSB setup, not on this rifle anyway. I also like the fact that the original is pinned in place and would be more solid than a screw on type.
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| I found the how-to part of cutting down the standard FSB to a low-pro, but I'm curious if it is always required to take the FSB off? I'm just nervous about the pins holding good after taking them off. I've read the horor stories of the pins being damn near impossible to get off and ruining the FSB. Idk if that is just internet B.S. or if there is truth to it. |
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Removing the FSB is really not that hard.
Take a good hard look at the pins on both sides of the FSB, one side is smaller, that's the side you want to punch from. Forget using some lil tiny punch to start with, the pins should have a nub sticking out the small side, so use a big ole flat tipped punch and a BFH to get them started. The FSB will need to be braced up on something SOLID, a 2x4 aint going to cut it, it needs to be metal. I use a vice with the jaws open just enough to let the pin drop through. Hold the barrel up there so that the pin is between the jaws and the FSB on both sides of the pin is resting on the jaws of the vice. Now hit the damn thing. Once the pins are flush with the sides of the FSB, then you can use a small punch to drive them the rest of the way out. Piece of cake, even with the notoriously tough to remove BCM pins. Think it only took about 2 good whacks to get them started moving. Punch selection. 
All apart. 
Lil cutting and grinding. 
You can cut the FSB while it's on the barrel, just go slowly and be careful not to nick the gas tube or the barrel. As for the pins holding tight after removal, no worries, drive em back in there with a BFH and you'll be good to go, no different then when they were first installed. |
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I've tried the procedures for removing an FSB twice with DPMS barrels/FSBs. Pins never budged, just widened like a rivet and froze in place. Had to cut the block off of there.
In most cases, I would just shave the FSB down to a lo-pro if I was getting a rail that could use the existing barrel nut. If the rail has a proprietary barrel nut, however, goodbye FSB. As posted above, however, a lot of people have an easy time getting the FSB pins out. Really, there is no harm in trying it. If you screw up, you'll probably just end up peening the edges of the pin over so that they can't be removed, in which case a shaved down FSB and Evolution rail work great. |
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I left mine on the barrel and cut it down, if you go this route make sure you have a good dremel tool. I also removed the gas tube to make the cutting easier
http://img.photobucket.com/albums/v66/Bammer5/IMG114-1.jpg |
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