Machine Gun ? [Archive] - Glock Talk


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03-16-2012, 11:28
I have a M11. I have seen 22 LR uppers for it.
My question is if I manufacture a upper in say 5.7X28 do i need to send a letter in on it to run the new upper?
In my case the whole gun is registered. I am running a lage upper on it right now, which does not change the caliber.

Zak Smith
03-20-2012, 09:41
The ATF should be notified in writing of any permanent changes to the configuration of the NFA item. In this case, caliber would be something they care about.