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wjkuleck · July 31, 2009, 03:37 PM

I believe that the SIG 551 lower is not the firearm; the serialled upper is*. Thus, I believe (I am not a lawyer!) that possessing a full-auto SIG lower is legal. However, if you also own a semi SIG 556 at the same time, you are in possession of a contraband machine gun, even if you never mate your SIG's upper with that lower—or, even that it would be possible to do so without some work. The BATFE can be very creative in these situations.

Best not to play with fire.

Regards,

Walt
*The inverse of the AR-type rifles, where the lower is the firearm.

July 31, 2009, 03:37 PM	#7
wjkuleck Senior Member Join Date: March 13, 2007 Location: Ohio, USA Posts: 1,220	I believe that the SIG 551 lower is not the firearm; the serialled upper is. Thus, I believe (I am not a lawyer!) that possessing a full-auto SIG lower is legal. However, if you also* own a semi SIG 556 at the same time, you are in possession of a contraband machine gun, even if you never mate your SIG's upper with that lower—or, even that it would be possible to do so without some work. The BATFE can be very creative in these situations. Best not to play with fire. Regards, Walt The inverse of the AR-type rifles, where the lower is the firearm. __________________ Author, NEW! The M1911 Complete Owner's Guide The M14 and M1 Garand Complete Assembly Guides The M1 Garand Complete Assembly Guide The AR-15 Complete Assembly and (New 4th Edition) Owner's Guides*