Glock G21 Gen4 .45 ACP Full-Size Pistol, Black, MH3 Tritium Night Sights, 10+1, Austria, SilencerCo Threaded Barrel Included
This Austrian-made Glock G21 Gen4 is a full-size .45 ACP with MH3-marked tritium night sights and key Gen4 upgrades. It features the dual recoil spring assembly, Gen4 rough-textured grip, modular backstrap capability, and an enlarged, reversible magazine catch. It comes with a 10-round magazine for 10+1 capacity and includes a SilencerCo threaded barrel (not installed), original case, and manual.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Overall Condition: Good - Clean, well-maintained, minor wear marks.
Bore Rifling: Good Rifling - Polygonal rifling intact with well-defined transitions.
Specific Condition Notes: The pistol presents in solid shape with scattered scratches and blemishes from prior handling. The bore has a bright interior.
What’s Included
- Original case
- User manual
- 1x 10-round magazine
- Speed loader
- SilencerCo threaded barrel (not installed)
The G21 Gen4 delivers the .45 ACP in a proven full-size format. Its 4.61 in steel barrel uses octagonal polygonal rifling with a 1:15.75 in right-hand twist, and the pistol maintains a sight radius of approximately 6.69 in for clear sight alignment.
Gen4 ergonomics include the rough-textured frame for secure purchase, modular backstrap capability, and an enlarged, reversible magazine catch (installed for right-hand use). The dual recoil spring assembly is a Gen4 hallmark, and the dustcover integrates an accessory rail for mounting compatible lights.
Both sights are metal tritium units marked MH3, arranged in a fixed 3-dot night-sight configuration. The slide carries the factory marking "GLOCK 21 Gen4 AUSTRIA 45 Auto" with rear vertical serrations for confident manipulation.
This pistol is Austrian-made and displays Austrian C.I.P. proof marks, an AT barrel mark, and a "MADE IN AUSTRIA" frame marking. The slide, barrel, and frame share matching serials.
Capacity is 10+1 with the included 10-round magazine. A SilencerCo threaded barrel is included but not installed, providing an additional barrel option alongside the pistol’s current configuration.