Can anyone comment on the longevity of the Primary Arms offerings as regards holding up to the recoil of medium-powered rifles? I was thinking of getting one of the Primary Arms to go on my AK until such time as I can afford an AimPoint Micro, then transfer it over to rimfire duty. In the interim, I would like to be confident that utilizing it on a 7.62X39 won't turn it into a pile of parts (to exaggerate slightly).