The M9 semi-automatic standard pistol of the U.S. Army and Air Force Security Forces

A short recoil, semi-automatic, single-action / double-action pistol, the M9 uses a 15-round staggered magazine with a reversible magazine release button that can be positioned for either right or left-handed shooters. The M9 is used with the M12 Holster (Part of the Beretta UM84 Holster System), though other holsters are often used.

The M9 has been modified as the M9A1, adding, among other things, a Picatinny rail for the attachment of lights, lasers, and other accessories to the weapon. The M9A1 also has more aggressive front and backstrap checkering, a beveled magazine well for easier reloading of the weapon, and a reversible magazine release. M9A1 pistols are sold with PVD coated magazines developed to better withstand the conditions in the sandy environments in Iraq and Afghanistan.