The Adams Arms P1 model includes Adam's Picatinny Railed Gas Block with 3 adjustable settings and M4-style furniture. The P1 is your Piston Driven foundation ready to be customized to fit your needs.

Specifications: 

• Upper Receiver: A4 Flat-Top Forged
• Barrel Length: 16″
• Barrel Contour: M4
• Barrel Material: 4150 Chrome Moly Vanadium Steel
• Muzzle Thread Pattern: 1/2″-28
• Chrome Lined: No
• Barrel Finish: QPQ Melonite / Black Nitride
• Twist Rate: 1 In 7″
• Chamber: 5.56x45mm NATO
• M4 Feed Ramps: Yes
• Bolt Carrier: Full-Auto Rated 1-Piece W/Integral Piston Strike Face
• Muzzle Device: A2 Flash Hider
• Gas System Length: Carbine Short Stroke Piston Operated
• Gas Block Diameter: 0.750″
• Handguard: M4 Handguards
• Sights: None
• Grip: A2 Grip
• Trigger: Standard G.I.
• Stock: 6-Position Collapsible
• Weight: 6.2 Lbs
• OAL: 32.5″ Collapsed
• Lifetime Warranty: Yes