Provides secure storage and easy access to two additional rounds of ammunition for competition shooting or storage of specialty loads. Low profile Spare Round Carrier fits .300 Win. Mag. rounds only. Mounts quickly and easily to the M-LOK® handguard with included tools. Machined from 6061-T6 aluminum for strength and durability. Includes Ruger logo on face of carrier. Carrier comes with two Allen keys to adjust tension and to mount onto the rifle. Weighs 1.6 oz. (empty) with included M-LOK hardware. Made in the USA by Hoptic USA.