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The 7.62×39mm (aka 7.62 Soviet, formerly .30 Russian Short) [5] round is a rimless bottlenecked intermediate cartridge of Soviet origin. The cartridge is widely used due to the global proliferation of the AK-47 rifle and related Kalashnikov rifles , the SKS semi automatic rifle, as well as the RPD and RPK light machine guns .
They can be chambered in 5.45×39mm, 5.56×45mm NATO and 7.62×39mm, and use a barrel and gas system assembly and iron sights line similar to that of the AK-74M/AK-100 rifle family. Improvements added from the AK-12 include Picatinny rails , a new pistol grip, a new adjustable buttstock and a new flash hider. [ 14 ]
The 6.5 Grendel bullets have a true diameter of 6.71mm / 0.264" and the 6.5 Grendel case can be formed from abundant 7.62x39 cases with a neck re-sizing die, and fire-forming a slight change to the shoulder, if the case is made from brass. Many of the popular 7.62x39 cases are made from steel, which will not work for reforming the shoulder.
The barrel end of the chamber is fluted, which assists in the initial extraction of a spent cartridge casing (since the breech is opened under very high internal cartridge case pressure). revised to the faster 178 mm (1:7 in) twist rate (used to stabilize new, heavier NATO-standard SS109/M855 ammunition).
Improvements were made to the initial design from the 1970s which made the rifle capable of handling more powerful cartridges such as the .308 Winchester/7.62×51mm and the more prevalent .223 Remington/5.56×45mm, 5.45×39mm, and 7.62×39mm calibers. These improvements contributed to the modern line of the Saiga rifles being adopted by many ...
Folks, I think the fellow was simply pointing out that the 5.56 mm and the 7.62x39 mm were lower power assault class rounds vs. the 7.62x51 mm Nato round. In point of fact the 7.62x51 mm Nato, 30.06, 308, 7.56x54 mm, rounds all have very comparable performance despite having small packaging differences. Tirronan 18:59, 7 October 2006 (UTC)
The MCX features a system that enables conversion between 5.56×45mm NATO, .300 AAC Blackout, and 7.62×39mm ammunition, using standard 5.56 mm STANAG magazines for 5.56×45mm NATO and .300 AAC Blackout, and specially designed STANAG-compatible magazines for 7.62×39mm. [10]
7.62 RK 56 TP – Modified Type 56-2 in China for Finnish use, with a new hammer spring that allows firing of Finnish 7.62x39. [21] QBZ-56C (Type 56C) – Short-barrel version, introduced in 1991 for the domestic and export market. The QBZ-56C as it is officially designated in China, is a carbine variant of the Type 56-2 and supplied in limited ...