ProMag AR-15 Magazine .223 Rem/5.56 NATO 42 Rounds Polymer Black COL-A16

I know, I know, it's pro mag. Love it or hate it, it is what it is. I purchased two and they arrived at my door in less than a week. I have examined them closely and have tried them out. No complaints and I really like being able to fire off 40 rounds (I have learned not to fill these mags to the 42 round limit as it puts stress on the springs). At the end of the day, I like them.