The 7.62x39 is an "intermediate" cartridge, i.e., one developed specifically to be more "controllable" in full auto fire than a rifle cartridge. The 7.62x51 is a standard, full power rifle cartridge. Therefore, all else being equal, any rifle chambered in 7.62x39 will be more "controllable" than the same rifle chambered in 7.62x51. For the same reason, the AK-47 will generally be much more controllable in full auto than a G3, FAL, AR-10, M14, etc. Those latter rifles all pretty much went the way of the dinosaur because they are so difficult to control in full auto fire that they are essentially ineffective. The M-16 and AK-47, with their less powerful cartridges, can be fired in full auto somewhat effectively from the shoulder by a single soldier, so those rifles have survived.hnk45acp said:I guess I'd say the 2 more popular chamberings x39 and x51
doubleg said:None of the others have a recoil buffer except for the G3, which has gas rollers.