I have about 2/3 of a large ammo box of USGI clips of all kinds Paul, and they all seem to work about the same as far as that goes. I looked through mine and many were SA. I think of them more as consumables - if one is bent or rusted, or seems to have a problem I just get rid of it. Haven't you just checked on GB or anywhere to see if there's any deals there? Sometimes you can contact people who have them for sale and they have boxes of them and get good prices in bulk. Just don't get any with rust or anything. I've done the same at gun shows - they're usually pretty cheap, anyway, and if you tell them you want a bunch they'll often cut you a deal.