Fits Glock 21 Gen 3 and Gen 4 slides in 45 ACP. CNC-machined from U.S. 416R stainless bar stock with titanium nitride plating, broach-cut rifling, and an aggressive target crown — built for tighter lockup and better accuracy out of a duty-size 45 ACP host. Slide not included.

Finish: gold TiN plating over 416R stainless. Adds wear and corrosion resistance, pairs well with most aftermarket Glock 21 slide finishes.

Specs

• Caliber: 45 ACP
• Material: U.S.-made 416R stainless steel bar stock
• Finish: titanium nitride (TiN)
• Rifling: broach-cut, 1:16 twist
• Crown: aggressive target crown
• Chamber: fully supported, polished feed ramp
• Fits: Glock 21 Gen 3 and Gen 4 slides (slide not included)
• Will NOT fit Gen 5 G21 or any other model
• Install by an experienced Glock armorer is recommended

Confirm your slide is a Glock 21 Gen 3 or Gen 4 pattern. Hand-cycle dummy rounds, then run roughly 100 rounds of standard 45 ACP ball for break-in before competition or defensive use. See our slide break-in guide for the full procedure.

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