The Adams Arms Agency is a semi-automatic rifle with aluminum alloy upper and lower receivers. A 16 melonited chromoly steel barrel is equipped with an A2 flash hider. Users can attach their choice of optics and other accessories to picatinny rails on the upper receiver and gas block. Further customization of the Agency is available via a six-position collapsible stock.DetailsRIFLE 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 17 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. - Doesnt vent directly to atmospheric pressure this eliminates flash signature and super sonic crack which is optimal for night vision and suppresses fire.