The BATTLE STEEL carbine railed forend is a high-quality 2-piece Picatinny forend for the AR/M4-type carbines that replaces the weapon's stock forend allowing the user to mount a variety of accessories. Machined to military specification hard-anodized aluminum, they're stronger, dissipate heat much better and provide rock-solid weapon fit. These precision rails enable consistent "repeat zero" of any accurately dimensioned devices attached to them. The 5 QD (quick detach) anti-rotate swivel ports that are located 2 per side, front and rear and 1 at the bottom front, prevent 360 degree rotation of the sling, for non-binding and twisting. Features: DROP-IN, 2 piece design, mounts just like factory hand guards. No gunsmithing required 4 Sided 1913 Picatinny Rail System. 5 QD (Quick Detach) Anti-Rotate Swivel Ports Top Rail Is In Line With Flat-Top Of Weapon Receiver Very Secure, No Movement Lifetime Warranty 100% US Made Specifications: Lightweight Only 8ox 6061/T651 Aircraft Grade Aluminum Type 2 Class III Hard coat Anodized CNC Machined For Solid Bar-Stock