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Tucker 1371 · July 31, 2009, 01:40 PM

I was just browsing gunbroker today when I found a full auto lower receiver to a Sig 551 and it got me thinking. Would it be legal to buy the full auto lower and then finish the gun with parts from compatible semi autos?

I don't know and seriously doubt that The Sig 551 lower and 556 upper are compatible but if they were would this be legal? Don't full auto lowers or trigger groups have to go through the same processes as complete full autos?

July 31, 2009, 01:40 PM	#1
Tucker 1371 Senior Member Join Date: December 29, 2008 Location: East TN Posts: 2,649	Full auto build, legal? I was just browsing gunbroker today when I found a full auto lower receiver to a Sig 551 and it got me thinking. Would it be legal to buy the full auto lower and then finish the gun with parts from compatible semi autos? I don't know and seriously doubt that The Sig 551 lower and 556 upper are compatible but if they were would this be legal? Don't full auto lowers or trigger groups have to go through the same processes as complete full autos? __________________ Sgt. of Marines, 5th Award Expert Rifle, 237/250 Expert Pistol, 382/400. D Co, 4th CEB, Engineers UP!! If you start a thread, be active in it. Don't leave us hanging. OEF 2011 Sangin, Afg. Molon Labe