Glock G21 Gen5 MOS .45 ACP Full-Size Pistol, 4.02 in Barrel, 13+1, Black nDLC
The Glock G21 Gen5 MOS brings the .45 ACP workhorse into the Gen5 lineup with a MOS-cut slide, Glock Marksman Barrel, and updated controls. This full-size pistol offers a 13+1 capacity, an nDLC-finished slide and barrel, and Gen5 ergonomics with a rough-texture grip and no finger grooves. Introduced in 2023, this variant adds ambidextrous slide stop levers and a reversible magazine release while retaining Glock's Safe Action system.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Minimal indications of prior handling. The bore presents a bright, mirror finish.
What's Included
- Glock G21 Gen5 MOS .45 ACP pistol
- Two 13-round factory Glock .45 Auto double-stack polymer magazines
- Glock factory plastic hard case
- Original manual
- Glock MOS adapter plate #06
The Gen5 treatment gives this G21 ambidextrous slide stop levers and a reversible magazine release for flexible control. The full-size frame uses the Gen5 rough texture with no finger grooves for a consistent, hand-filling grip in .45 ACP.
The 4.02 in steel Glock Marksman Barrel features enhanced rifling, a target-style crown, and an nDLC finish. The slide wears a matching black nDLC finish with front and rear serrations, plus a MOS optic cut with the cover plate installed from the factory.
Sight picture is straightforward and durable with fixed polymer sights: a white-dot front paired to a white-outline U-notch rear. The dustcover integrates the Glock Universal accessory rail for lights or other compatible accessories.
Markings include Glock proof/logo, AT, and Made in Austria with GLOCK, INC., Smyrna, GA import information. The G21 Gen5 MOS configuration was introduced in 2023, bringing the .45 ACP model in line with the latest Gen5 feature set.