Turn your Spyder MR paintball gun into a tactical M4 assault rifle with this carbine package. Your Spyder MR paintball gun's distance and accuracy will be greatly improved as well. The RAP4 tactical paintball barrel kit is the ultimate realistic upgrade for your Spyder MR paintball gun; it comes with a 16" M4 style paintball barrel and a removable muzzle brake. The muzzle can be removed to install a silencer, grenade launcher, or other awesome upgrades. This RAP4 tactical paintball barrel kit also comes with a M4 style front sight, tactical hand guard, and a butt stock. This is a complete, ready for action.