I purchased 4 of these mags in late 2008. I did not have an opportunity to try them out until the weekend of 17-18 April 2009. My son and I were sighting in a new holographic sight on the 14 and tried three of the four clips purchased (30 round units). Not only were the clips difficult to lock into battery position, but the rifle frequently jammed due to poor feeding. We also had mis-feeds that caused the round to pop upright. Multi-round clips are purchased by me as a convenience item. The performance of these clips makes them worthless.
Poor quality best summarizes the attributes of this product. My magazine will eject a live round every fourth or fifth shot and somtimes while I'm loading the mag. a round will pop out. I will not buy another.