#5100 - 9x39 Brass
1.516” - 1.520” O.A.L.
This Soviet cartridge was originally designed for subsonic use in AK style firearms. Many US companies are now offering AR style barrels, uppers, and complete firearms chambered in 9x39. Our brass is built to the CIP standard, and could have headspacing problems if used in firearms designed around non-standardized versions. Due the differences in chamber dimensions, we recommend you contact your barrel manufacturer about compatibility with our brass.
**WARNING** In firearms that use a floating firing pin (such as the AR-15 and its variants), dropping the bolt on a chambered round could lead to a slam fire. It is important that these firearms are loaded from the magazine so that the bolt loses inertia when it strips a round from the magazine. It is also important NOT to use sensitive primers that aren't designed for use in an AR, as this increases the chance of a slam fire.
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