RIFLE SPECIFICATIONS - Mil-Spec Forged 7075-T6 Lower Receiver Type III Class II Hard-coat anodized finish beveled magwell machined chevrons in front strap - Mil-Spec Forged7075-T6 M-4 Upper Receiver Type III Class II Hard-coat anodized finish M4 feed ramps 1913 - Picatinny rail flat top with dry lube internal finish and laser engraved T-markings - 16 Carbine Barrel 1:7 twist - Chambered .223/5.56 x 45 mm NATO - Weight: 6.4 lbs - Classic lightweight base rifle built using a 16 barrel and our industry leading piston system. - THE ADAMS ARMS PISTON SYSTEM - A short stroke free floating piston system. - Is Self-Cleaning. - Carbon and gases are expelled forward away from operator. - Corrosive resistant coating processes. - Harmonics are not transferred into the barrel. - Adjustable gas settings for various applications. - Doesn't vent directly to atmospheric pressure; this eliminates flash signature and super sonic crack which is optimal for night vision and suppresses fire.