AR-15 SP1 Registered Receiver
Registered receiver Colt AR-15 Model SP1 that was converted prior to 1986. This has a large pin to small pin conversion and currently has an original M-16 11.5 commando A1 upper on it. Additionally this gun still has the original plastic coated aluminum stock on it that has painted over peen marks from the factory on castle nut. That signifies that it has never been taken off !