PWS 15" Free Float KeyMod Handguard - AR15/M4 The PWS KeyMod handguards features the KeyMod Interface System developed for multiple accessory compatibility without the need for picatinny rails surrounding your handguard. The improved design enhances the rails comfort and functionality without sacrificing strength or durability. Industry leading features include a solid handguard machined from extruded 6061-T6 aluminum, a continuous top Picatinny rail and QD sling swivel points at the front and rear of the handguard. This super-slim handguard. Brand Primary Weapon Systems Finish Anodized - Black Material 6061 Aluminum Platform AR-15 Profile Quad Top Rail Continuous Type Free Float - 1 Piece Accessory Attachment KeyMod Barrel Nut Proprietary - Included Length 15 Outer Diameter 1.8" W x 2.1" H Dimensions 15" L x 1.8" W x 2.1" H Inner Diameter 1.35" W Weight 13.3 oz - See more at: http://www.primaryarms.com/pws-15-free-float-keymod-handguard-ar15m4/p/5kmr1151/#sthash.2qgVQgls.dpuf