The Wilson Combat Glock 21 match barrel is a drop-in .45 ACP replacement for Gen 3 and Gen 4 Glock 21 pistols, fully machined from 416R stainless steel and heat treated to Rockwell C 40. Wilson Combat machines it to tolerances under five ten-thousandths of an inch and rates it for groups of two inches or less at 25 yards with quality ammunition. Its 1:16 twist conventional broach rifling accepts lead, jacketed or plated bullets without the pressure concerns of shooting lead through the factory polygonal bore, which makes it the natural upgrade for a .45 shooter who reloads. The chamber is glass smooth and perfectly concentric with the bore, and the external chamber corners are chamfered to reduce friction as a round feeds. Wilson Combat calls it a drop-in and notes minor fitting is occasionally necessary, so a Glock 21 used for competition or high-volume practice gains accuracy without gunsmith work.

Key Specifications

• The chambering is .45 ACP, matching the Glock 21.
• It fits the Glock 21, Gen 3 and Gen 4, as a drop-in replacement.
• The steel is 416R stainless, fully machined.
• It is heat treated to Rockwell C 40 for a long service life.
• Rifling is 1:16 twist conventional broach, safe with lead, jacketed or plated bullets.
• The chamber is glass smooth and perfectly concentric with the bore, with chamfered external corners.
• Tolerances are held to less than .0005 inch, and Wilson Combat rates it for two-inch or smaller groups at 25 yards.

Frequently Asked Questions

Is it safe with cast lead bullets? Yes. The conventional broach rifling accepts lead, jacketed or plated bullets, unlike the factory polygonal barrel.

Does it fit a Gen 5 Glock 21? No. Wilson Combat lists this barrel for Gen 3 and Gen 4 Glock 21 pistols.

Is any fitting required? It is a drop-in design. Wilson Combat notes minor fitting is occasionally necessary and recommends a qualified gunsmith if it is.

Buy the Wilson Combat Match-Grade .45 ACP Barrel for Glock 21

For a .45 ACP Glock that eats cast reloads and still shoots tight, this is the barrel to drop in. Order the barrel Wilson Combat lists as item 381 with the rest of our Glock barrels from our Lubbock, Texas gun shop for fast, insured shipping.