Can you get a barrel to convert from 9mm to 40 or are the slides different sizes ?

Converting 40c to 9mm
This link to the thread will help shed some light on the subject. Hope it helps.

I am not one of the experts here but I have read that you can go from 40 to 9mm, but not the other way...I could be wrong...oops should have read the post closer....never mind...the website posted above addresses it

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carpe diem
one day at a time

I've heard of some that made the conversion. The barrel opening in the slide has to bored out to fit the barrel & I think the recoil spring has to be changed as I understand it. Of course you'd also need .40 cal mags. I don't know how successful the conversion was. I wouldn't recommend it.

I also believe I read somewhere that someone made a conversion by getting a .40 cal slide & used the 9mm frame. I think the slide would fit. I don't know what the cost of slide, barrel & mags would cost & if it would be worth it as opposed to buying a used 40 cal M&P.

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Former USN, Retired US Army

probably cheaper just to buy a m&p 40

You can do it yourself, but this is a better idea all the way round. If you have the money, why not buy another gun?

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Freedom isn't free.

Probably just get fs .9mm so I can use same ammo and mags


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