The M-15? DEF15F is legendary Armalite quality in a streamlined platform. The Defensive Sporting Rifle is a high-quality no-frills rifle well suited for duty sport or defense. It weighs in at 6.1lbs has a forged flat-top receiver with MIL-STD 1913 rail and features an A2 front sight gas block. This combination ensures a tough dependable rifle that is easily customizable to any configuration.Features: PRODUCT LINE: M-15 PRODUCT CATEGORY: Defensive Sporting Rifle CALIBER: .223 Rem/5.56x45mm BARREL: HB Double Lapped Chrome Lined/Chrome Moly Vanadium BARREL LENGTH: 16" GAS SYSTEM: Carbine Length TWIST RATE: 1:7 RH MUZZLE DEVICE: Flash Suppressor FRONT SIGHT BASE: A2 HANDGUARD: Standard 6" STOCK: 6-Position Collapsible UPPER RECEIVER: Forged Flat-Top with MIL-STD 1913 Rail 7075-T6 Aluminum LOWER RECEIVER: Forged 7075-T6 Aluminum SAFETY: Standard TRIGGER: Single Stage CHARGING HANDLE: Standard FINISH: Hard Anodized Aluminum OVERALL LENGTH: 32" Collapsed | 35.3" Extended WEIGHT: 6.1lbs INCLUDED: One 30-Round Magpul PMAG Owner's Manual WARRANTY: Limited Lifetime Warranty