Glock magazine bodies are plastic with integrated metal parts, so materials costs are lower but manufacturing is harder. Some companies make Glock-compatible ma

Glock magazine bodies are plastic with integrated metal parts, so materials costs are lower but manufacturing is harder. Some companies make Glock-compatible magazines out of metal, and those have higher capacity in the same volume (eg: Shield Arms). I think the Glock design is excellent, but the magazine is the weakest part. It's not bad, it's just not as good as some others.