wilson
mccormick are pretty good, but i find the wilson ones are slightly better....they are less likely for the lips to swell out and cause the mag from falling free,
the macgar will not fit if you have on a magwell.
the mccormick are easier for taking apart to clean...
so, you all 8 rounders that you have, but if you're buying some new as well, get the wilson mags....especially if they have them in 10 rnd's.