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Would need a really good flash suppressor. And I'm wondering about the stress point where the upper and lower recoil spring/buffer tube meet. Recoil of a .308 is a bit more than a 5.56. I've seen rifles which needed a new lower because some guy purchased a .308 to ride his AR 15 lower.

I purchased and mounted three different piston kits on AR 15 rifles: Adams Arms, Osprey Defense, and CMMG. All three performed as advertised, but of the three the Osprey was far and away the most maintenance free in a few thousand rounds. The Adams Arms is the kit I prefer, since I use that rifle to run a CMMG stainless .22 conversion kit and the piston rod comes out easily and the gas can be turned off completely when shooting dirty .22lr ammo, so no debris gets up into the gas cycle. The Osprey is darn near self cleaning, with the simplest and most efficient system of the three, if all you intend to shoot is 556 or 223. I would like to mount a 5.45 x 39 with the Adams Arms and see how it runs, but not writing a review of that so can't afford the equipment.

I wonder how well the 16” barrel stabilizes the 7.62 round. I bought a Springfield SOCOM 16 a few years ago and it sucks. It sucks like it is the worst shooting rifle I own, even compared to a battle beaten, brought back from Vietnam SKS.

I've seen rifles which needed a new lower because some guy purchased a .308 to ride his AR 15 lower.

.308 won't feed through the AR-15 magazine well - the cartridge is too long. Must've been some other custom chambering.