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Thread: Considering a Barrel Swap and Free-Float Install

  1. #31
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    Quote Originally Posted by blackscot View Post
    Can you elaborate? As long as I have either the receiver or barrel secured, what else is needed to loosen the barrel nut?

    I'm willing to buy whatever is needed to not screw anything up, but likewise would prefer to not end up with tools that I didn't really need.
    The barrel is not part of the threaded system. Just like turning on the FH with only the upper secured, turning on the nut with only the barrel secured could cause you to enlarge the index pin notch.

    It's just the right way to separate two threaded halves: hold one half, turn the other. In the case of the barrel nut and the upper receiver the barrel itself is not one of those halves.

    Or, do it your own way. It's been awhile since we had one of those "hey, I tried to build a gun with a bent butter knife and a 2x4 and now it's ****ed up" kinds of threads.

  2. #32
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    Quote Originally Posted by rob_s View Post
    The barrel is not part of the threaded system. Just like turning on the FH with only the upper secured, turning on the nut with only the barrel secured could cause you to enlarge the index pin notch.

    It's just the right way to separate two threaded halves: hold one half, turn the other. In the case of the barrel nut and the upper receiver the barrel itself is not one of those halves......
    Now I understand.....need to see if Brownells can update my order with addition of the receiver block.

  3. #33
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    Feb 2007
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    Well I caught Brownells in time to add the receiver block to the order.

    I'll need the receiver block because I decided to remove the Delta ring by taking off the barrel instead of cutting the ring. I want to have the option of returning the gun to the original non-FF-handguard configuration.

    For the same reason, I also am ordering a low-profile gas block instead of cutting down the existing FSB, which I want to leave intact. Since this M&P/Stag has the unique in-to-the-right pins, I'm not sure that I would be able to find a new FSB with the large and small holes on the correct sides to correspond with the taper direction of the pin holes on the barrel. Also, the $35 for the new gas block seems worth not having to take on the extra work of cutting and grinding the old FSB.

    And I still haven't ruled out eventually trying a pencil barrel, although I am going to complete the FF-handguard install as a separate project first. Obviously I'd need the receiver block to replace the barrel. Also, if I were to end up liking the pencil barrel well enough, I'd want the option to sell the old barrel which I would include the pinned FSB with.

    So everything needed is hopefully on its way. Thanks everyone for all the info. I'll post before/after pics in a separate thread once complete.
    Last edited by blackscot; 04-30-12 at 13:08.

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