Just got my set in on friday and put them to work today. Excellent mags. Have to get me another set.
I have a T.M. version with an 8.4v 1200 on it and the mags keep up with the R.O.F. Not one misfeed until my high cap T.M. mag went in. Once again Excellent!
I have the Well R-4/MP-7, got it from here, and also purchased a couple of these mags, they work perfectly, and I didn't lube them at all. My guess is now I need to buy like 2 or 4 more!
If you have a MP7 you need to buy these! They do need to be lubed before use but that is with any magazine. This is an amazing deal for 6 of these 100 round non-winding magazines only 50 bucks. I will gladly sacrifice the 50 rounds of the high caps, which you have to wind, for these.