The US Army rejected Glock's 19X for the XM17 trials primarily due to a lack of true modularity, a key requirement. While Glock added a manual safety, Sig Sauer's P320 (M17) offered a superior modular system with a removable trigger group, allowing one chassis to function across different frame sizes. This modularity, combined with a lower projected cost per soldier for multiple configurations, led to Sig Sauer's selection over Glock.
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