I currently have an SP-1, Colt AR-15 (Pre-Ban). Therefore no forward assist, no good rear sight or brass deflector. I am also a southpaw so with out the brass def. I catch it in the face on every round. So I would like to swap out the
upper assy with either a Bushmaster or Fulton Armory upper ( $450-750) Depending on barrel quality and whther I get the flat top or not.
Also have an Aimpoint Red-dot in want to mount on the new upper. Any Ideas??