Crafted from hard coat anodized 6061-T6 aluminum, the RFB Quad Rail is approximately three inches long and designed to accommodate any accessories that utilize a standard MIL-STD 1913 Picatinny rail attachment. The two scalloped cut-outs on the top of the rail provide shooters with the flexibility to adjust the gas system as needed while ensuring that ejected casings can exit the ejection port unobstructed. It's important to exercise caution when selecting accessories for the left hand side of the weapon, as certain mounts may block the ejection port. Additionally, the riser is also made from hard coat anodized 6061-T6 aluminum, ensuring durability and reliability for all your mounting needs.