I read in an other forum that pinning a flash Hider/comp is no longer accepted by the ATF. It has to be welded or silver soldered. Don't know if it been brought up here before.
2.1.3 Rifle. A rifle is a firearm designed to be fired from the shoulder and designed to use the energy of an explosive in a fixed cartridge to fire only a single projectile through a rifled barrel for each single pull of the trigger. A rifle subject to the NFA has a barrel or barrels of less than 16 inches in length....
(snip)
NOTE: Any muzzle attachment such as a compensator, choke device, muzzle break, etc., is not included in the barrel length measurement unless the attachment is permanently affixed to the barrel. Acceptable methods for permanently attaching a device to a shotgun barrel are deep penetrating, full fusion, gas or electric steel seam welds or high temperature silver solder.
ATF used to allow blind pinning -- drill a hole through the compensator into the barrel, insert a section of steel drill bit slightly shorter than the hole, weld over the top of the hole, file/dress the weld smooth, then spot-refinish. But this alternative was removed from the NFA Handbook between the 2008 and 2009 editions.
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