I just ordered a Bushmaster XM15 E2S A3 20" from my dealer. I should get it by next week. I now want to convert a Colt AR15 SP1 (very early model, serial is 1008XX) into a carbine.
I plan to get the bushmaster preban 16" Shorty A3 upper receiver. I assume that it has threads on the barrel for a flash suppressor as I plan to put a Bushmaster Shorty look flash suppressor on it. I also plan to swap out the old Colt buttstock with the fiberite six position telescoping buttstock.
I also think that I will need an offfset pin to attach the bushmaster upper to my Colt lower. Is there any other parts that I need?
Do you see any other problems becuase I have a very early version of the Colt AR15 SP1?
Kin, There is one other problem, your SP1 lower is grey, the BM upper will be black. the colors do not even come close to matching. For a color match you will have to get your lower re finished in black.