Macon Armory .40 S&W AR Pistol Caliber Carbine (PCC): 3.75" Barrel (5/8 x 24) and notched Bolt/BCG - $100 Shipped.
Concentric threading for suppressor use.
Bolt is notched to accept Glock magazines.
Bolt and Barrel havea few hundred rounds through them max. Barrel coating shows wear, but otherwise excellent condition.
Threaded 5/8 x 24.