Odin Works PMB Sig Sauer 320 Handgun Magazine Base - Blue - Guaranteed to give you an edge, Odin Works has designed their PMBs (Pistol Magazine Bases) with the competitive and noncompetitive shooter in mind. It is ergonomically machined to fit perfectly in the palm of your hand for effortless stripping. The weighted base allows for rapid magazine changes and 5 extra rounds all while remaining well within the 140 mm gauge limits of USPSA. The base is CNC machined out of 6061 billet aluminum and hard anodized to ensure durable, long-lasting color. The Sig Sauer 320 PMB comes complete with an extra power spring and Odin Works' proprietary threaded pin to ensure extremely limited magazine failures. Includes Extra Power Spring, Threaded Push-Pin And Allen Wrench 1.5oz Weight Includes Base And Screw Compatible With Sig Sauer 320 6061 Billet Aluminum