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I know it's available for the Glocks. Is a drop in barrel available in .357Sig, for the .40cal. S&W M/P model? Quick look thru my Brownells catalog, and I didn't see one. But that doesn't mean one's not out there. Anyone know of a company making one, or maybe just change the factory .40 for a factory .357Sig? Never heard of anybody doing this. Both factory mags that came with mine, are stamped .357Sig. Just curious! gypsyman
 

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Looks like a barrel change is all that would be necessary.
Savage
 

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One reason I do like my Glock 22. Have 9mm, 40 S&W, and 357 barrels for it. Besides barrel, need different mag for 9mm.
 

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A little off topic, but---
My Sig 239 requires only a barrel change from .40 too .357Sig or vice versa--using the same mags.
Blessings
 

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William,
That's pretty much true of all manufacturers pistols. The .40 and .357 Sig are both based on the same cartridge case, so use the same mags. Barrel change only, required between those two calibers.
Savage
 

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I wanted one for my Sig Pro but watched too many other guys have problems with the same gun and they often made real expensive .40 brass by fire forming the .357 and you need a cleaning rod and a hammer to get a lead loaded .40 out of a .357 Sig barrel, when you close the slide. And these were gun guys doing this.
My only advise if you really want the second barrel is to paint it a different color on the breach or write .357 and 40 on the breach in large letters, the little stamped ones are hard to see when at the range, and you never want to look into the front end to see how big the hole is.
The .357 in the forty barrels make a funny noise and the bullets key hole into paper and if the cardboard, the target is stapled to, is thick like a wax packing crate it will bounce back at you. No stopping power there. LOL
I decided that I would be happy with my .40 and only have to stock two types of ammo for the one handgun (Defense and target) rather than 4 types. (D&T) X2
Also the .40 seems to be cheaper to shoot.
My problem is with Mr. Murphy. He is always looming and sure as anything the .40 barrel will be in the gun and I pack .357 Sig ammo for a match.
Don't get me wrong I think .357 Sig is a great round and am saving my pennies in hopes of finding a P226 in it used someday.
 

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I leave the 357 Sig barrel in my Glock 22 since I have a XD Tactical 40 and a XD Tactical 9mm , Ruger SR9 and P95 in 9mm. I like the 357 better than the 40..........
 
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