AR-15s

What you run into Colt vs others is the parts kits, the takedown pins are different sizes etc. Its probably a non issue but i would think Colt is true to the original late 50s 1960s mil specs. My Ar is a Buishmaster bought 20 years ago i have no complaints,it looks liek an M 16 no collapsible stock, no picatinny rails and all that extra chit people put on them just iron sights etc