Quoted: I've been a long time member of the AR side of the house, and I'd figure I'd migrate over here for a while. I don't own any guns (yet), and the AR is the only one I am internally familiar with. The only thing I know about the AK is that it doesn't require the buffer tube and spring to extend into the buttstock, which is obvious due to the side-folding and under-folding stocks I always hear about.
Anyway, how is the AK system different from the AR? And what the hell is a piston?? I recall something about it being in or near the gas tube, but I can't quite remember.
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Basically, the AK has a large metal piston extending forward into the gas block, over the top of the barrel...
When it fires, the gas pushes the piston out of the block (at which time gas pressure is released, and the remaining gas vents), compressing the recoil spring and cycling the action using the inertia of the bolt-carrier)...
The end result is a tad worse accuracy and a bit more felt recoil, but it allows a simpler design...
The AR gas system is alot more refined & complex: when the rifle fires, gas is directed back into the bolt carrier. The gas-impulse first unlocks the bolt, then pushes the carrier off of the gas tube, cycling the action.... Unlike the AK, all AR components are in line with eachother (spring, buffer, carrier, barrel), resulting in less felt recoil and more accuracy. Disadvantage: ARs are harder to clean, as the gas vents into the reciever instead of into the air...
Both designs use a rotating bolt, as opposed to the FAL or M14 style...
And the stuff about the AR jamming from carbon fouling is (now) an urban legend, which had it's roots in the early deployment of the AR system to Vietnam, where it was issued with poor-quality ammunition, non-chromed barrels (a problem in the Vietnamese environment) and no cleaning kits (the Army took 'Self Cleaning Gas System' to mean 'Self Cleaning Rifle', and told everyone you didn't need to clean your AR in the field).... As of now, all of that has been corrected, but the 'legend' remains...
In the end, both rifles are pretty well perfect for the tactics they were designed for.
The AK was designed for close support of armor formations, and to that end, it works... Accuracy to 500m is a non issue, as the tanks take care of taht, and the troops with AKs keep enemy infantry off the tanks... Use of full auto fire was the 'primary' mode, which is why the order on a FA AK goes 'Safe, Full, Semi'.
The AR, on the other hand, was designed based on US military infantry tactics, whch emphasized long-range accuracy. So we end up with a base design effective to 300m 'point' or 600m 'area', and 'improved' versions that reach to 1000.m
To each his own: the AK was designed as more of a close quarters weapon, the AR as a 'reduced' long-range weapon ('reduced' means 300m from 800m, the prior expected 'point target' range)...