Quoted:
Also, any magazine, including factory magazines that hold more than 30 rounds have a very short life expectancy in my humble opinion. I'd never trust my life to a 40round magazine.
quote]
I have faith in my 40-rounders, as do a couple of other people on this board. They work. Each time. Every time. I don't keep them loaded, only keep two 30 rounders loaded (25 in each, to help keep the springs "springy"). I have had my 40-rounders for over 2 years now, and have prolly fired over 2000 rounds in that time period, without a single misfeed, FTE, etc. They also hold the bolt open after the last round has been firedt, something the cheap aftermarket mags have had problems with. Honestly, I was hesitant about the performance of these mags when i ordered them, but they work. I got mine for 45 a piece, they go for around 50-80 bucks a piece now.