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Okay Industries make the finest aluminum magazines available - also supplied to Colt and also sold as NHMTG. As with everything they may let a bad mag or even batch get out the door, but statistically these should be the most consistent and issue-free.
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OKAY is OK then :D
I also have the Center Industries. black follower. so far nothing wrong with it so I didn't modify or replace the spring and follower. I still have some springs and green follower. should have gotten the magpul ones.
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Okay/Colt/NHMTG magazines are the best GI magazines available.
They have the most consistent dimensions and consistent seam and weld fit.