Front Sling Mount for Tactical Rails with Heavy Duty Quick Detach (QD) Swivel. CNC machined and manufactured from 6061 T6 aluminum by Midwest Industries, hard coat anodized to Mil-Spec. Mounts on your tactical handguards with Mil-Std 1913 Rails. This MI (Midwest Industries) sling mount includes the heavier sling mount, larger base and has a built in anti-rotate feature to prevent the sling mount from spinning around 360 degrees and twisting up the operators sling.