I started the RBRD (Retro Black Rifle Disease) with a 1972 Colt M16A1 (603 ) black then a Retro CAR 15 (XM177E2) hybrid with a 11.5 Pencil barrel and 5 in FH/BRAKE (fake Moderator) with Old School Aluminum CAR stock and 6 hole Hand guards , then an M16A2 20" HBAR clone with Green furniture , then a late 1966 XM16E1 (Gray) , then a 1975 Colt M16A1 (603) gray. I'm currently holding back from another build by wanting a USGI S&W or Colt 1917 Revolver ...