Odin Works Sig Sauer 320 Pistol Magazine Base - Black - Guaranteed to give you an edge, ODIN Works has designed their PMBs (Pistol Magazine Bases) with the competitive and noncompetitive shooter in mind. Introducing the SIG Sauer 320 PMB: Ergonomically machined to fit perfectly in the palm of your hand for effortless stripping, their weighted base allows for rapid mag changes and 5 extra rounds all while remaining well within the 140 mm gauge limits of USPSA. CNC machined right here in Boise, ID out of 6061 billet aluminum and hard anodized to ensure durable, long-lasting color the SIG PMB comes complete with an extra power spring and our proprietary threaded pin to ensure extremely limited mag failures. 1.6in x 1.2in x 1.12in At The Widest Points Combatible With Sig Sauer 320 Includes Extra Power Spring, Threaded Push-Pin, And Allen Wrench