The RFB Quad Rail is expertly crafted from hard coat anodized 6061-T6 aluminum and measures approximately three inches in length. This versatile Quad Rail is compatible with any accessories that utilize a standard MIL-STD 1913 Picatinny rail attachment. Its two scalloped cut-outs on the top provide shooters with the flexibility to adjust the gas system as needed while ensuring that ejected casings can exit freely from the ejection port. However, it is important for shooters to exercise caution when selecting accessories for the left hand side of the weapon, as certain mounts may obstruct the ejection port. This thoughtful design enhances functionality while maintaining the performance of your firearm.