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Keep in mind, every time the rifle is fired, there are two things accelerating the bolt; the pressure from the gas against the piston, and the spring pushing forwards. A heavier spring is going to accelerate forwards faster, where the gas isn't going to change all that much. If you just get a heavier spring and throw it in there, there's a pretty good chance you're going to be cycling shorter. A softer spring may cause the bolt to strike the rear trunnion, which is also bad. The AK is designed so that the bolt goes nearly all the way rearward before it runs out of steam and the spring returns it to battery.
Now, if you want to make your gun cycle faster, increasing the amount of gas pressure applied to the piston in accordance with the weight of the spring, and possibly trimming some weight off the bolt carrier may just do it. But you probably won't notice the difference, and there's still a good chance you're going to screw something else up. Could slamfire from the bolt moving faster, could outrun your magazines, and probably would increase wear, maybe damage rivets.
Better yet, get an AR, which already is faster, and JP makes a special low-mass higher springrate carrier/buffer/spring combo that may just get your rifle to cycle unnecessarily snappy.
Now, if you want to make your gun cycle faster, increasing the amount of gas pressure applied to the piston in accordance with the weight of the spring, and possibly trimming some weight off the bolt carrier may just do it. But you probably won't notice the difference, and there's still a good chance you're going to screw something else up. Could slamfire from the bolt moving faster, could outrun your magazines, and probably would increase wear, maybe damage rivets.
Better yet, get an AR, which already is faster, and JP makes a special low-mass higher springrate carrier/buffer/spring combo that may just get your rifle to cycle unnecessarily snappy.
