AIM Sports Inc AR15 Tri-Rail Barrel Mount. This mount by AIM Sports Inc is constructed of black anodized aircraft grade aluminum and accepts all standard Weaver / Picatinny 1913 accessories. The AIM Sports AR-15 Aluminum Tri-Rail Barrel Mount gives you the features to go with performance. Specifications for AIM Sports AR-15 Aluminum Tri-Rail Barrel Mount: Length: 2.5" Weight: 4.5 oz Features of AIM Sports Inc AR-15 Platform Tri-Rail Barrel Mount: Black anodized aircraft grade aluminum Accepts all standard Weaver / Picatinny 1913 accessories Compatible with AR-15 platforms Package Contents: AIM Sports AR-15 Tri-Rail Barrel Mount AIM Sports Inc MT026: AR15 Tri-Rail Barrel Mount