I had ACT magazines that came with my NH and purchased a few under Wolff. They all started to fail to drop freely from the mag well. The mags all had well under 500 round count and not subjected to hard use at all. I longer use or purchase any mags made by ACT. I believe the feed lips started to spread which probably caused it to fail to drop freely but did not confirm with a caliper. I do not recommend them but if you must buy them, I would recommend getting it from NH because they didn't give me a hard time with the exchange. On the other hand, Wolff did give me a hard time with the exchange and I am surprised and disappointed with them.
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