AIM Sports Inc AR Free Float Mid Length Quad Rail/V3 10in Black Medium. This rail mount manufactured by the experts at AIM Sports Inc is made of black anodized aircraft grade aluminum and is compatible with most carbine length direct impingement gas systems. The AIM Sports Inc Carbine Length AR Free Float T-marked Quad Rail Mount has a no gap for monolithic rail look and accepts all standard Weaver/Picatinny 1913 accessories. Specifications for AIM Sports Inc Carbine Length AR Free Float Quad Rail- V3 Black Medium MT060: Length 7.1875: Weight 9.7 oz: Features of AIM Sports Inc AR Free Float Quad Rail/V3 Black anodized aircraft grade aluminum T-marked rails Accepts all standard Weaver / Picatinny 1913 accessories Compatible with most carbine length direct impingement gas systems One piece design No gap for monolithic rail look Mounts over low profile gas blocks Package Contents: AIM Sports Inc AR Free Float Quad Rail/V3 Barrel nut for mounting AIM Sports Inc MT061: AR Free Float Mid Length Quad Rail/V3 10in Black Medium