|The whole story on this mag; I bought 2, both were lacking spring tension and jammed every time. I contacted Shooter's Ridge and was informed that they redesigned this magazine and they were more than happy to exchange them FOC, less shipping. After many hours and boxes of different brands of ammo, I can confidently state...
The 2nd series is very good as long as you use it as follows;
1 Only shoot CCI ammo through it,
2 Keep your rifle USMC clean,
3 DO NOT use it as a handle (that's what stock accessories are for).
If you love CCI, clean weapons and short, high capacity mags; this is a very good choice.
I'm giving it 4 bullets instead of 5 because of the headache I went through gathering all this intel.|