Cross Machine Tool HDM Free Float AR-15 Handguard - ARCA / M-LOK - 15"

The Cross Machine Tool HDM ARCA Swiss Rail is a free float AR-15 handguard built for shooters who use ARCA-compatible tripods, integrating an ARCA Swiss mounting surface directly into the rail so no extra components are needed to attach the rifle to a tripod.

• 6000-series extruded aluminum, Mil-Spec Type III Class 2 hard black anodized
• 7075 aluminum barrel nut, Type III Class 2 hard anodized
• 17-4PH cored stainless steel rail mounting attachment (patented)
• ARCA Swiss profile integrated at the 6 o'clock position
• M-LOK slots at the 1, 3, 6, 9, and 11 o'clock positions
• Anti-rotation tabs time the rail to the upper receiver
• 1.315" internal diameter
• Made and assembled in the USA

The wider ARCA Swiss mounting profile gives a more stable shooting surface than a typical round handguard when shooting off a bag rest or barricade, without adding a separate ARCA plate to the rifle. No barrel nut shims are required for installation, and the rail doesn't contact or apply side loads to the gas tube, so it installs cleanly on a standard Mil-Spec upper without extra fitting work. At 15 inches, this longer option leaves more rail space for a bipod, light, and grip together, while anti-rotation tabs keep the ARCA surface and M-LOK slots correctly timed to the upper receiver every time it's mounted.

Cross Machine Tool builds precision-machined AR-15 components aimed at shooters who need their rail to maintain zero when mounted to a tripod or barricade, backing every rail with US-made construction.