Glock 21 Gen4 .45 ACP Full-Size 13+1 Semi-Auto Pistol – Tenifer Finish
The Glock 21 Gen4 combines the stopping power of the .45 ACP cartridge with Glock’s proven reliability and Gen4 ergonomics. Its modular back-strap system, enlarged reversible magazine catch, and dual captive recoil spring assembly make this full-size pistol adaptable and easy to control, while the Tenifer-treated slide and barrel resist wear and corrosion.
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 Condition: Good Rifling – Intact, well-defined lands and grooves.
What’s Included
- Factory Glock hard plastic pistol case
- One 13-round factory Glock polymer magazine
- Two interchangeable Glock Gen4 back-straps with beavertail extensions
The Gen4 series adds a dual captive recoil spring assembly that softens felt recoil and increases spring life, a useful upgrade for a .45 ACP platform.
An enlarged, reversible magazine catch lets right- or left-handed shooters perform faster reloads without needing aftermarket parts.
The modular back-strap system ships with two beavertail options, allowing four overall grip sizes so the shooter can fine-tune reach to the trigger.
Tenifer heat treatment on the 4.61-inch barrel and slide creates a matte black surface that is extremely hard and highly resistant to corrosion, supporting long service life even under adverse conditions.
Fixed polymer 3-dot sights provide a clear sight picture out of the box, and the integral accessory rail on the dust cover accommodates lights or lasers. Matching serial numbers on the slide, barrel, and frame confirm original factory fit.