I recently had a AR-STONER mag bust apart the 1st time I loaded it. I would stay away from them. I have had problems with C-Products also. I have had good luck with Pro-Mags, and Colt. I just ordered a L-5 Polymer mag. Havent used one before, but they have good reviews. AIMSURPLUS has them right now 30rd mag $18.99 with 1 cent shipping.