i have a nato converted chilean mauser thats in 7.62x51 aside from the magazine being a bit longer than the rounds i've never had a problem with it. it's solid as a rock and i've shot commercial grade and surplus ammo. the surplus is cheaper and i dont recommend using commercial grade. milsurp ammo from nato countrys are usually all loaded at slightly lower pressures to accomodate the differences in firearms which may end up using the ammo, the metals used in their construction, and quality of manufacture. for example if a frenchman had to salvage ammo from an american m60 machine gun to use in his 20yr old fn fal he wont have to worry about his gun exploding(it's just an example i know very little about m60's or fals)
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