I have Polish Mini Beryl pistol that I'm going to convert to an SBR. It has a booster & flash hider combination device at the muzzle that can't be readily removed due to detent on the font sight / gas block being fixed in place. You can't push it in to allow the device to rotate. The device does rotate back and forth on the threads a hair, but can't be removed. For the purposes of making an SBR, does the device count as a permanent part of the barrel? I need to know this in order to calculate the barrel length and overall length. I also need to know for sec922(r) compliance purposes.
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