Guncrafter Industries Glock 21 Gen 3 .50 GI Conversion, 4.6" Match Stainless Slide, 13+1 rd Semi-Auto Pistol
This custom Glock 21 Gen 3 has been professionally converted by Guncrafter Industries to fire the proprietary .50 GI cartridge. The package pairs a hand-fitted 4.6-inch stainless match barrel and matte stainless slide with the familiar polymer Glock frame, yielding big-bore performance in a duty-size platform. Two double-stack 13-round Glock magazines are included, giving the shooter a full-power .50 GI option with Glock ergonomics and reliability.
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.
Bore Rifling: Excellent Rifling – Sharp lands and grooves.
Light signs of wear are visible on the slide flats and frame, and a few shallow surface scratches are present. These marks are purely cosmetic and do not affect function.
What’s Included
- Glock factory polymer hard case
- Two 13-round Glock G21 magazines
The Guncrafter Industries conversion keeps the original Glock large-frame breech face by using a rebated-rim .50 GI case, allowing the pistol to maintain standard Glock 21 feeding geometry while delivering a .50-caliber punch.
The stainless slide is less common than Guncrafter’s typical Melonite finish, offering a durable matte appearance with distinctive contrast against the black polymer frame. Rear cocking serrations provide positive traction for slide manipulation.
A match-grade 4.6-inch stainless barrel is precisely fitted for consistent lock-up and accuracy. The barrel’s standard land-and-groove rifling works cleanly with the .50 GI projectile and shows sharp, well-defined rifling.
Fixed sights consist of a white-dot front and white U-outline rear, giving a familiar sight picture for rapid alignment. The frame retains the Gen 3 accessory rail for lights or lasers, and all controls remain in the standard Glock locations.
With a 13+1 capacity, this full-size pistol delivers big-bore ballistics in a package that feels immediately familiar to anyone who runs a Glock 21, making it a standout choice for shooters seeking something unique without sacrificing shootability.