Different than any forend ODIN Works has ever made, the Ragna is a complete change from past forends. Literally designed for the fastest install possible, the RAGNA features a one piece barrel nut with no shims or clocking needed. Available in 12.5" 15.5" and 17.5 inch lengths, the RAGNA will make any build better. Strong, lightweight, and unique, the RAGNA is available with MLOK or KMOD attachment points where you need them.Features :Free floatingType 2 Hard AnodizeOnce piece barrel nut, Black Nitride coatingAll mounting hardware includedAccessory rail not includedMade from 6061T6 aluminum,Inside Diameter: 1.35";"Outside Diameter: 2.02" Tall by 1.52""KMOD or MLOK available at 3, 6, and 9 oclockAll .750 ODIN Works gas blocks fit inside