This is an OEM Sig factory magazine compatible with Sig Sauer full-sized P320 pistols or P250 pistols.Sig factory mags come with the rugged reliability you might expect as police and military rely on these very sig products to function flawlessly.This magazine can fit ten rounds of 40SW or 357 SIG ammo and is made of steelSig Sauer P320/P350 .40 Smith & Wesson & .357 SIG Magazine10 round capacityBlack finishSteel body reliable internal spring and feed lipsSig Sauer factory quality stands up to police and military requirementsFor any owners of a Sig P320 full size or a P250 this magazine is perfect for you!It's a great idea to have spare magazines around as it can save your valuable range time from being wasted loading the same few mags over and over.Order yourself a few more Sig factory mags and have them loaded and ready with either FMJ for range days and training or leave them full of hollow-points if this is your home defense gun.Score big savings and fast shipping on all your favorite Sig Sauer Firearms and Accessories available online at Ammunition Depot.