It looks like the newer ACT mags may have a different cut at the rear of the feed lips. The mags actually run well in all my guns. UNFORTUNATELY they are extremely fragile. I busted the feed lips on my old mags. The new ones don't seem to have that problem but the baseplates are made out of craptanium.
Let those who are fond of blaming and finding fault, while they sit safely at home, ask, ‘Why did you not do thus and so?’I wish they were on this voyage; I well believe that another voyage of a different kind awaits them.”
Christopher Columbus
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