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5.45x39mm Ammo
The 5.45×39mm cartridge is a rimless bottlenecked rifle cartridge. This rifle ammunition was introduced into service in 1974 by the Soviet Union for use with the new AK-74 assault rifle. It gradually supplemented, then largely replaced the 7.62×39mm round in service.
NOTE: The primary sources for this caliber's ammo supply are suffering from the war in Ukraine. We haven't seen any available in quite some time, same with the other old soviet calibers: 7.62x39, 7.62x54R and 9Makarov. The steel cased ammo suppliers were mostly from old Russian factories along with some from Ukraine. There are other factories in countries like Romania and apparently some of the lesser known former soviet countries like Azerbaijan that are producing some commercially available ammo in 7.62x39, but nothing yet in 5.45. U.S. manufacturers have almost completely ignored 5.45x39 production with so far only Hornady ever making anything in this caliber. There are brass cased offerings in 9Mak, 54R and 7.62x39, more expensive than steel cased, but at least they're produced. 5.45 on the other hand, hopefully somebody steps up.