The new ArmaLite Defender series AR-15 semi auto rifle is loaded with features. Kicking off this build are the 7075-T6 forged aluminum upper and lower receivers. The Defender 15 features a 16" chrome lined barrel with a 1:7" twist rate which has been threaded 1/2x28. A birdcage style flash hider is used to suppress flash. The ArmaLite Defender rifle also features an A2 pistol grip polymer handguards and collapsible stock. This semi-automatic rifle is chambered in 5.56 NATO/223 Remington. It has a 6" handguard flash suppressor and includes 30-round Magpul PMAG. This model has a railed gas block front sight base.Features / SpecsArmaLite Defender 15 Semi Auto Rifle DEF155.56mm NATO (accepts .223 Remington)16" Double Lapped Chrome Lined Chrome Moly Vanadium MIL-B-11595-E BarrelWith M203 Step down1:7" Right hand twistThreaded 1/2x28Flash suppressor muzzle deviceGas block with picatinny rail7075-T6 Aluminum Flat Top Upper Receiver7075-T6 Aluminum Lower ReceiverSingle Stage TriggerPolymer handguardsA2 pistol gripCollapsible stock30 round magazineAnodized upper and lower receiverManganese phosphated steel barrelOverall Length: 32" Collapsed / 35.25" ExtendedOverall Weight: 6.35 lbsBlack Select view and download your favorite Armalite Rifle resources including owner's manuals gun schematics and spec sheets for the Armalite AR10 Armalite AR30 Armalite M15 and more by visiting the Armalite Rifle Owner's Manuals and Resources page!