If you're talking about the grey parked, solid tab, unmarked mags, I have two. I took them both to the range and they worked very good. Only problem was that I could only squeeze 19 rnds in them. Maybe they need a break in? My new GI mag was also really tight but took all 20. Other than that, no problems at all. I'll buy 2 more from the next gun show that I find them for $20.