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Joined: Nov 2019
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Does anyone know if adding a 4 1/2" barrel extension to a 12" AR pistol barrel will render the resulting 16 1/2" barrel legal when using a shoulder stock? The extension is just a screw-on hollow tube of the same OD as the barrel, but it's not rifled or grooved in any way. I can't seem to find a reference for something like this, and the ATF doesn't seem interested in returning my questions.

GB1

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Has to be permanently attached to the barrel - typically pinned and welded.

The 11.5 carbine barrels with the 5.5 inch "muzzle device" have been this way for decades.

Last edited by AH64guy; 09/27/23.
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Look up pin and welded to make length.



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No way I’d take the velocity loss and still wind up with a 16” barrel.

But yes pin and weld would make it legal.

You can do a form 1 e-file and make an SBR with it. Pay $200 tax stamp and wait about 45-60 days for approval if it’s legal in your state.

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Originally Posted by TWR
No way I’d take the velocity loss and still wind up with a 16” barrel.

But yes pin and weld would make it legal.

^^^THIS^^^


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It couldn't legally be removable so there wouldn't be a point to it.

Either SBR a lower or buy a 16" upper are your two options


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