The Adams Arms Gas Piston System is an end user installed after-market product for Mil-Spec ARs. It will fit on any AR barrel with a .750" or 3/4" diameter at the shoulder where the front sight base sits. The Pistol Length version will work on barrel lengths from 7.5" to 8.5" that has an existing pistol gas system. It also features a Free Float Quad Rail manufactured by Samson that bolts directly to your standard barrel nut.
- Piston Assembly
- Gas Block and Tube
- One-Piece Bolt Carrier
- 4" Free Float Quad Rail
- Installation Instructions (DVD)