Glock G21 Gen4 .45 ACP, Threaded 5.25 in Barrel, Optics-Milled Slide, Suppressor-Height Sights, Custom Red Controls
This Glock G21 Gen4 stands out with a factory Austrian-marked slide, a threaded steel barrel measuring approximately 5.25 inches, and a professional optics cut fitted for the Burris FastFire 3 footprint. It is further customized with suppressor-height iron sights, a high-visibility front sight marked 'TG-H3', and a coordinated set of aftermarket red-finished controls. Two magazines are included: a 26-round extended .45 Auto magazine and a 13-round Glock factory magazine.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Rifling: Excellent - Strong, well-defined polygonal rifling.
Specific Condition Notes: This firearm presents in great shape overall, with minor scratches and small blemishes visible on close inspection. The bore is clean and shiny.
What's Included
- Glock factory hard case
- Glock owner's manual / Important Safeguards booklet
- 1x 26-round .45 Auto extended magazine (brand not confirmed)
- 1x 13-round Glock G21 factory magazine
The G21 Gen4 configuration delivers a full-size .45 ACP platform with the Gen4 RTF grip and finger grooves, a reversible magazine catch, a dual recoil spring assembly, and the modular backstrap system (no backstrap installed). The polymer frame includes an accessory rail for mounting lights or similar frame-mounted accessories.
The steel barrel is threaded and measures approximately 5.25 inches, capped with a knurled thread protector. Suppressor-height iron sights are installed, with a high-visibility front sight stamped 'TG-H3' for a bright, precise aiming reference.
The slide is optics-milled with a multi-hole pattern and is fitted for the Burris FastFire 3 or other directly compatible footprints, offering a straightforward path to adding a micro red dot that matches this cut.
Aftermarket red-finished controls tie the build together, including a skeletonized two-tone trigger shoe, slide stop lever, slide lock/takedown lever, magazine release, and frame pins. The slide rollmarks are red paint-filled for a cohesive look. Capacity is 26+1 with the included extended magazine; a 13-round Glock factory magazine is also included.