40 S&W pistols to 9 mm can be done under certain circumstances, I personally wouldn’t trust my life to a barrel-change conversion without a lot of rounds through the gun, absent any stoppages. There are a lot of “depends ons” to your question. Several of my fellow gun buffs are telling me that this conversion can’t be done with any degree of reliability. 40 S&W and swapping the barrel for a 9 mm to subsequently reap the benefits of less recoil and cheaper ammunition. I was thinking of picking up a Glock, SIG Sauer or a Smith & Wesson M&P in. 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. To subscribe to the magazine, visit the NRA membership page here and select Shooting Illustrated as your member magazine. This article, 'Forty to Nine, not so Fine' appeared originally as a Tech Wisdom column in the June 2017 issue of Shooting Illustrated.
