This is not a NEW problem as far as designing a 7.62x39 mag for the AR/Robinson mag well. I own a VERY old COLT 7.62x39 barreled upper. It has NEVER functioned reliably with anything more than the shitty Colt Five Round (5rd ) mags. I though MAYBE the drastic curve with the cproducts mag might work. I do understand they do have to be "broken in" before use. Well why the hell can't cproducts set up an air operated upper and lower to "precondition" the mags? If they don't pass back to the reject pile, or melting pot or whatever they do with shit that doesn't work. > ???