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How to Convert the Glock 33 to .40

Chambered to fire .357 SIG ammunition, the Glock G33 is a subcompact handgun commonly used for concealed carry. The G33 can be quickly converted to use .40-caliber ammunition, by replacing the weapon's barrel with one from a G27 (the subcompact Glock pistol chambered for .40-caliber). This is possible because both the .357 SIG and the .40-caliber bullet have identical-size shells; the difference is that the front of the .357 SIG is slightly smaller to accommodate the .357 SIG bullet.

Things You'll Need

.40-caliber barrel for G27 pistol

Instructions

- 1
  Check the action of your G33 pistol to make sure the weapon is unloaded. Remove the magazine.
- 2
  With one hand hold the top of the slide and -- with your other hand -- pull down the slide-locks located on each side of pistol just above the trigger.
- 3
  Pull back the slide approximately 1/10 of an inch and immediately push the slide forward; the slide assembly will separate from the lower receiver.
- 4
  Turn over the slide and remove the spring assembly. Lift the .357 SIG barrel out of the slide and replace it with a .40-caliber barrel (built for a G27).
- 5
  Reassemble the G33 pistol.

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