This is a m4 that I stripped and put a mechanical polastar in. With it I have a strap, plastic grip, 2 high cap mags, 2 dummy suppressors, and 3k psi ninja tank with home made regulator. Great gun I just no longer have the time to play. This gun shoot pretty quite I would get a new regulator but don’t have the money. The regular I have is reliable it’s medical high pressure rated but just looks weird. The lines I have for the tank and gun r both strong and will not crack.