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  1. #1
    Major ddan24's Avatar
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    Default Bushmaster M4 Gas Block Removal

    So i've been thinking of this for a little while now. Finally purchased a gas block from AST at their grand opening. I've gotten the gas block pin out since this picture, but am dumbfounded as how to remove the rest. Do I have to dremel/drill out the other pins in the bottom and cut it in half for it to come apart? I don't think my dremel skills are good enough where I won't damage the barrel.

    Any thoughts?
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  2. #2
    BANNED
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    Did you remove both pins in the gas block?

    What kind of muzzle device do you have?

  3. #3
    Captain Brad@AST's Avatar
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    3 pins get driven out, the gas tube and the two on the bottom.

    sight base pins are tapered, and have to be driven out from the LEFT side to the right.

    If you need help or an extra set of hands bring it by some night this week and I will help you.
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  4. #4
    Major ddan24's Avatar
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    It's like there are caps on both sides of the other pins. The one pin (top) was easy to remove. The others didn't seem to move at all. I will try hitting them harder... it's not like i'm going to reuse it or anything.
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  5. #5
    Captain Brad@AST's Avatar
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    Need a no-bounce surface, and a very stiff punch. make sure you go left to right and hit it hard.
    Allstar Tactical
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  6. #6
    Major JStarX7's Avatar
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    Sometimes those suckers just refuse to come out. I tried everything to remove the pins from my Bravo company gas block, and ended up cutting it off with a Dremel.
    Whiskey Tango Foxtrot?

  7. #7
    Administrator Jeff's Avatar
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    Will the gas block even fit over the brake? I assume it's welded on.
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  8. #8
    Captain NewYorker's Avatar
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    . .
    Last edited by NewYorker; 03-11-2010 at 11:05 PM.

  9. #9
    Captain aveisone's Avatar
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    not going to use it? send it to me? ill pay shipping.
    I enjoy manipulating mechanical devices which propel small lead projectiles through space at high velocity.

  10. #10
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    If you remove the permanent muzzle brake, even to change the gas block, doesn't that make it illegal, even for just a short time while its off? btw, I think that's a stupid law

  11. #11
    Major JStarX7's Avatar
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    Quote Originally Posted by Draco41 View Post
    If you remove the permanent muzzle brake, even to change the gas block, doesn't that make it illegal, even for just a short time while its off? btw, I think that's a stupid law
    No, not as long as the upper is not put back on the lower while you are doing it.
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  12. #12
    Sergeant Evilrp's Avatar
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    Quote Originally Posted by JStarX7 View Post
    No, not as long as the upper is not put back on the lower while you are doing it.
    This is correct...


    Put your upper on a solid surface and use a large hardened steel punch. Hit the pins VERY firmly until they break/move then tap them out the rest of the way. They will come out ... don't be afraid to hit the punch hard. 2 or 3 whacks will break even the most stubborn taper pins. If you live near Ontario and can't make it to AST I'd be glad to help you out as well.

    If the break is welded on you'll need to remove that to remove your current FSB, that can eaily be done with a drill press and/or steel chisel depending on how it's welded. IM if you'd like any further help.

    ETA: Looking at your pics ... the muzzle break has to come off either way for the other GB to go on. Your going to need help regardless of who it's from if you've never done one before.
    Last edited by Evilrp; 02-28-2010 at 11:55 PM.
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  13. #13
    Major tinker's Avatar
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    Before you whack out the front sights pins, make sure the muzzle break will come off. No sense in hammering away at the front sight if it cant get past the muzzle break. I would take it to Brad and see what he can do.

  14. #14
    Major ddan24's Avatar
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    Quote Originally Posted by darkvibe View Post
    Will the gas block even fit over the brake? I assume it's welded on.
    It's welded

    Quote Originally Posted by aveisone View Post
    not going to use it? send it to me? ill pay shipping.
    This thing is not coming off unless it's in pieces (cut apart)

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