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Converting .40 S&W Pistols to 9 mm

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Article first appeared at Ammo Land.

Factors like a slight difference in the outer diameter of a replacement barrel and excessive recoil-spring weight may affect reliability when attempting to convert a semi-automatic from .40 S&W to 9 mm.

With the recent move away from the .40 S&W to the 9 mm within the law-enforcement community, there are a lot of agency-owned trade-ins on the market for ridiculously low prices. I was thinking of picking up a Glock, SIG Sauer or a Smith & Wesson M&P in .40 S&W and swapping the barrel for a 9 mm to subsequently reap the benefits of less recoil and cheaper ammunition. Several of my fellow gun buffs are telling me that this conversion can’t be done with any degree of reliability. Why not?

Brian Hopkins, Atlanta, GA.

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