Sig Sauer OEM Black P365 X-Macro 9mm Luger Handgun Magazine - 17 Round - This SIG Sauer Magazine is a factory replacement magazine for the SIG Sauer P365X-MACRO pistol. Chambered in 9mm Luger, it holds 17 rounds of ammunition. The magazine comes configured for use with the P365X-MACRO, but after swapping out the baseplate for one of the two additional baseplates the magazine can also be used in the original P365, P365X, or P365XL. Rear witness holes on the magazine body offer a quick view of the remaining ammunition in the magazine and a high-visibility orange follower makes it easy to identify when the magazine is unloaded. Don't settle for less when feeding your SIG Sauer pistol, load up with SIG Sauer OEM factory mags.