Why is virtually all commercial and military ammunition for the 7.62x39mm loaded with the same bullet weight of 123gr? Does the cartridge not perform well with lighter of heavier bullets? - Quora
Norinco 7.62x39mm Chinese Surplus Rifle Ammunition - 123gr FMJ, Steel Core / Steel Case, 25rd Paper Pack (May Be Corrosive). Reliable Gun: Firearms, Ammunition & Outdoor Gear in Canada
7.62x39 AP/API opinions? - General Ammunition Discussion - International Ammunition Association Web Forum
DIAMONDBACK 7.62x39 AR Pistol, 7 Barrel, W/ 9 M-LOK Rail, MBUS Sights, W/ 10x Mags, Black - Diamondback Firearms