Glock 21 Gen5 MOS .45 ACP Full-Size Pistol – Red-Anodized Enhanced Controls, 13+1
This U.S-made Glock 21 Gen5 MOS pairs the hard-hitting .45 ACP chambering with the latest Gen5 updates and factory optic-ready slide. It stands out for its red-anodized extended ambidextrous slide-stop lever and matching extended/reversible magazine catch, giving the shooter quicker, more positive control without altering Glock’s proven reliability.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Condition: Excellent – Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent – Sharp lands and grooves.
Specific Condition Notes: Minor superficial scratches and blemishes are present on the slide and frame but do not affect function.
What’s Included
- 2 × 13-round Glock OEM magazines with orange followers
- Glock factory hard case (black polymer clamshell)
- Cleaning tools
- Glock user manual
- Glock MOS adapter plate (one plate)
- Loose factory Gen5 ambidextrous slide-stop lever
- Loose factory Gen5 reversible magazine catch
The Gen5 MOS slide combines Glock’s durable matte-black nDLC finish with front and rear cocking serrations and a factory MOS optic cut. This is the first production run of the Glock 21 to ship exclusively with the MOS system, giving shooters plug-and-play compatibility with popular micro red dots.
Inside the slide sits the Glock Marksman barrel—nDLC-treated steel with hexagonal rifling and a 1:16 RH twist—for improved accuracy and easy maintenance. The clean 5.5-lb Safe Action trigger and three passive safeties maintain Glock’s familiar feel and consistent break.
The polymer frame features a flared mag-well, interchangeable backstrap capability, and full ambidextrous controls. The upgraded red-anodized slide-stop lever and red extended magazine catch provide faster, more intuitive manipulation while retaining the original parts (included) for buyers who prefer the stock configuration.
With its 13+1 capacity, full-size grip, and .45 ACP stopping power, this Gen5 G21 offers a balanced platform for duty, competition, or home defense—enhanced here with user-friendly upgrades and optic-ready versatility straight from Glock’s Smyrna, GA facility.