1-Complete BIG BORE upper receiver, larger ejection port, with forward assist.
1-16" Stainless Satern .450 barrel with matched bolt
1-15" Keymod free floating handgaurd and barrel nut(depending on stock MLOK maybe available upon request)
1-Fritz Tactical Stainless Muzzle brake, US Made by Satern
1-Micro .875 gas block
1-Stainless steel gas tube(mid length)
1-Head-spaced Nitride .450 Bushmaster specific bolt carrier group
1-Mil-Spec Charging handle