A “Bushmaster” is a brand name, not a type of rifle. Lots of other companies make the make type of rifle. Bushmaster is not the exclusive maker (over 20 companies make AR15 parts and major components not counting all the hundreds of places that assemble guns from parts) , the first (Armalite), or even the biggest (DPMS even makes more) or the best (no agreement on who is) or even the best known (Colt). They are not what Xerox is to copy machines or Coke is to soft drinks or Kleenex is to tissue paper.
SO STOP CALLING IT A BUSHMASTER AS IF THAT IS A NOUN. IT’S A RIFLE.