Compared: Glock 20 vs Glock 21 (10mm & 45 ACP) 

Comparing Glock's Standard size (Full size everywhere else) 45 ACP and 10mm offerings.
Our full review of Glock 21: • Full size 45 - Glock 2...
Our full review of Glock 20: • Glock 20 Gen4
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