This guide covers the installation and compatibility of Shield Arms' new DS20 (20-round) and DS18 (18-round) magazines for Glock firearms. It emphasizes the necessity of a steel magazine catch to prevent wear on standard polymer or aluminum catches due to the steel construction of the Shield Arms magazines. The DS20 offers a flush-fit 20-round capacity for Glock 17 frames, while the DS18 provides a flush-fit 18-round capacity for Glock 19 frames, representing significant capacity increases over OEM magazines.
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