The adams arms p1 is the introductory model to the p-series.This model features ergonomic magpul moe mid-length handguards, the standard adjustable picatinny railed piston system, a 6-position magpul moe stock, and an enhanced trigger guard.The p1 is perfect for any and all ar enthusiasts looking for a self-cleaning, piston driven rifle that provides superior performance.Action: Semi-AutoCaliber: 308 WinBarrel Length: 16"Capacity: 20+1Trigger: Standard G.I.Oal: 34.50"Weight: 8 lbsStock Description: Adjustable MagpulMuzzle: A2 Flash HiderReceiver Material: AluminumSights: Picatinny RailBarrel Description: Chrome Moly VanadiumTwist: 1:10"Barrel Length Range: 18" to 18.99"Weight Range: 8 lbs to 8.99 lbsHand: RightStock Finish Group: BlackMetal Finish Group: Blued/Black