This review of the Glock 21 Gen 5 MOS in .45 ACP highlights its improved grip ergonomics compared to previous generations, particularly for larger calibers. The MOS system is noted as functional, and the firearm demonstrates surprisingly controllable recoil impulse, shooting flat and making target acquisition easy. Initial reliability concerns were resolved after a break-in period, with the firearm performing exceptionally well with AAC .45 ACP ammunition.
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