The CMMG Carbine Length Piston System clamp on carbine lenght piston conversion for .750 barrel replaces front sight base, handguard cap, handguards & bolt carrier on any gas operated AR-15 style upper. The Piston is hard chrome plated & removable from front of gas block. Features 1-piece bolt carrier has integral impingement key for max. strength   The CMMG Carbine Length Piston System Gas block has On/Off setting for use w/suppressor. Remove piston & set gas system to Off for use w/.22 CMMG conversion system. Also features a bayonet lug which most piston systems don't have.

For use on any AR-15 or M-16 w/any caliber & barrel length w/carbine gas system