SLR Rifleworks 13.7" Solo Ultra Lite Series (Keymod)
13.7" Exact top rail length Weight 9.5 oz 1.3" ID Gen 4 Mil-Spec Hardcoat Anodize 7075 Barrel nut w/ Hardcoat Anodize Melonite Finish Hardware Free Floating Design Slip fit locking mount design Billet Anti Rotation Insert Anti Slip Design Barrel nut uses standard wrenches or SLR Billet wrench Mil-Spec 1913 Mounting rails