Manufacturers come out with new refrigerators every year and the most reliable company 5 years ago might be just average today. Also, every company will have good models and bad models so instead of focusing on which manufacturer to buy from, it's better to look at specific refrigerator models instead. Of course, best selling doesn't always mean best quality or most reliable.
Double stacked magazines give you about double the magazine capacity of single stacks, but they are slightly less reliable for two reasons. They are more prone to drop jumbles and the ammunition loses alignment and won't feed without fixing the problem.
The Alpha Type 2 magazine is constructed to accept (10) ten-rounds of 308/ 7.62x51 NATO ammunition. The Type 2 magazine is designed to be used as an alternative to the AICS/AE series magazine. If your rifle chassis or drop bottom metal ( DBM ) accepts the AI series magazine, the Alpha magazine will interface and funtion as designed for .308 ammo.