Short definition
The GLOCK 21 Gen5 MOS is a full-size, striker-fired .45 ACP duty/defensive pistol from Glock’s Gen5 family with the MOS (Modular Optic System) plate — factory optics-ready, rugged polymer frame, Glock Marksman Barrel (GMB), and Gen-5 ergonomic/operational updates for modern service and carry use.
GLOCK 21 GEN5 MOS
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Caliber: .45 ACP
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Action / System: Striker-fired (Glock Safe Action)
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Capacity: 13 + 1 (standard)
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Barrel length: 117 mm / 4.61 in (Glock Marksman Barrel)
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Overall length: ~205 mm / 8.07 in
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Weight (unloaded): ~735 g / 25.9 oz
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Slide / Finish: Optics-ready MOS slide with removable mounting plates; nDLC/black finish typical
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Sights: Factory fixed sights; optics option via MOS plate
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Notable Gen5 features: No finger grooves, reversible magazine catch, ambidextrous slide stop, improved marksman barrel
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Country of manufacture: Austria
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