The 5.56 Foxtrot M-LOK Handguard is a lightweight free floating handguard featuring a continuous Mil-Spec 1913 Picatinny rail. Constructed out of 6061 T6 Aluminum and hard coat anodized for superior finish and strength. The sleek extrusion with M-LOK attachments creates a light weight design that can support lights, sights, lasers, and all other accessories only where desired. Three hardened Allen screws for rock-solid alignment and hold with upper receiver.. The flat end of the Foxtrot allows for maximum customization, while maintaining a sharp geometric profile.These handguards are a slim profile with an approximate interior width of 1.3".Includes: 5.56 Barrel Nut and Hardware (Barrel nut will be INSTALLED inside of handguard)**If barrel nut is difficult to remove from handguard thread your upper receiver into the barrel nut and pull lightly to remove barrel nut.7" Foxtrot (7.196")Weight: 5.6oz9" Foxtrot (9.56")Weight: 7.2oz11" Foxtrot (11.136")Weight: 8.8oz13" Foxtrot (13.5")Weight: 10.4oz15" Foxtrot (15.076")Weight: 12ozInstallation of the barrel nut requires a 1 3/16" crowsfoot wrench. A 9/64 Allen key is required to tighten the 3 screws.PROUDLY MADE IN THE USA!.