Lenny Magill reviews MBX all-steel magazines for Glock handguns, detailing various lengths and capacities suitable for competition. He covers 140mm, 155mm, and 170mm options, noting standard and competition follower differences affecting capacity and slide lock. The review also highlights MBX extensions for factory 33-round magazines, increasing capacity to 57 rounds for PCC matches, and advises on potential magazine release wear.
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