Midwest Industries MI-ULW12.625 AR-15 Free Float Hand Guard 12.625" Overall Length Extremely Lightweight Titanium Barrel Nut and Screws Included Barrel Nut Wrench Included Features Patented 4140 Heat Treated Torque Plate For Simple Installation 12.625" overall length 7.9 oz Installed Weight Rugged 6061 Aluminum Type 3 Hard Coat Anodized MIL-STD 1913 Picatinny Top rail Two Integral Anti-Rotation QD Sling Sockets Super Slim 1.5" Outside and 1.3" Inside Diameter 4 Sides of M-Lok Slots 5-Slot Polymer M-Lok rail included Fully Dehorned and Deburred 100% Made in USA- Keeps America Working MI Lifetime Warranty Matte Black Manufacturer's Note:Due to the many different dimensions in BILLET UPPER RECEIVERS on the market, please contact your billet upper receiver manufacture to insure fit of this hand guard. This hand guard is compatible with standard forged upper receivers. NOT FOR USE ON GAS PISTON AR's!