Ar15.com user [HaveBlue] has been working for some time on a 3D printed lower receiver ... Strengthened the bolt hold lugs, which when the magazine is empty lifts a lever assembly that catches ...
this 3D printed AR-15 lower receiver is the only part of an AR-15 that contains the ID markings and serial number. Legally, the AR lower is the gun, and requires a background check to purchase ...
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