I probably don't take advantage of this as much as I should. I have a .40 barrel for my P229 and almost never use it. Lately, I've been thinking of outfitting all of mine with a spare .40S&W barrel This is the SHTF side of me thinking out loud rather than my which caliber do you prefer side ( 357sig wins hands down) The prices would run from 50+ dollars for my M&P to $180+ dollars for my Sig 2340. Throw in the others and I would almost have the price of a new pistol wrapped up in.40 S&W barrels... Wanna kill these ads? We can help!