Tucker 1371
New member
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?
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?