Adams Arms Gas Piston System.

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 version will work on barrel lengths from 7.5" to 8.5". The Carbine version will work on barrel lengths from 10.5" to 16" that has an existing carbine gas system. The Midlength version will work on barrel lengths from 16" to 18" that has an existing midlength gas system. The Rifle version will work on barrel lengths from 18" to 24" that has an existing rifle gas system.

This is the list of handguards Adams Arms currently know will work with their system without any modifications, this list will be updated as more handguards are discovered to work with their system:

1. Samson Manufacturing Star-M-EX-P
2. Daniel Defense Omega Rails
3. Daniel Defense Lite Rails
4. Daniel Defense Omega X Rails
5. Daniel Defense 9.5 FSP Lite
6. Daniel Defense EZ Car 7.0
7. Ergo Grip AR Z Float
8. Ergo Grip AR Z Rail
9. Midwest Industries Gas Piston Carbine Two Piece Free Float Forearm
10. Arms #50 Bi-Level S.I.R. System
11. Troy Industries MRF-DI
12. PRI Gen III Delta Carbon Fiber Forearm
13. Newtown Firearms Modular Free Floating Carbine Rail

Adams Arms Installation Video

Adams Arms Gas Piston Build Assembly Video