Quad rail system Top & bottom 2pc design with integral spinal cords/alignment housing Perfect fit with barrel nut & round front cap Made from aircraft grade aluminum with precision CNC machining Excellent anodizing/engraving Fits Carbine length of model 4/15 rifles Provides four Weaver/Picatinny rails each with 14 slots Zero-retention capability for all accessories installed on the rails Easy installation, no barrel modification needed Made in USA Black rubber rail guards included Aluminum 11.3 oz 4 rails 6.7" long 2.4" wide 2.4" high Attach this 2-piece Weaver/Picatinny mount onto your gun's foregrip for added versatility in the battlefield. This 2-piece system clamps together and creates a quad rail that lets you attach flashlights, red dot sights and lasers for fast target acquisition. No modifications are needed for your gun! This rail system is proudly made in the USA and is made with aircraft grade aluminum with precision CNC machining. 14 slots per rail.