My question concerns changing a .40 SW Shield to 9mm. I already have a DPM 9mm/.40 recoil spring installed. How reliable would it be to install a new 9mm barrel and 9mm mags?

Apparently the 9mm magazines would work. This would seem to be a reasonalby easy conversion.

Can anyone offer their experience on this?

The best way to convert your Shield from .40 to 9mm is to purchase a .40 to 9mm conversion barrel. A couple of companies are TR Enabling and Lone Wolf Distributors. You will also need to use 9mm magazines.

I don't have a Shield, but I suspect that the 9mm and 40 bolt faces are different sizes. In order to do just a barrel swap, the bore and chamber would need to be offset. Extractor may need to be modified.

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Judge control not gun control!

Thanks to all ywho have sent advice. After considering will remain with the .40 Shield. I would need the CA approved 9mm barrel since this Shield has the 'loaded' display built into that barrel. I did a check of the recommended marketers. Will have to take pains (pardon the pun) to assure my trigger finger doesn't go up against the trigger guard. Careless I guess..

I subscribe to not throwing good money at a problem there are better solutions for. Buy the 9mm of your choice - keep both for a while. Sell the one you like least or better yet, keep both if you are so inclined. This method give you the most latitude without incurring a risk of screwing up a good gun, gives you a buyers remorse back out on the 9 should you feel you made a mistake, and no need to spend money on a conversion barrel which might be a substantial portion of money towards the new gun.

Truer words have never been spoken. A Shield is about a $300 gun and the expense to convert to a ‘maybe’ is not money well spent. Being a resident of CA only adds issues...

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S&W factory revolver armorer

OR>>>>>>>>>>>>>>>Do like me and BUY THEM BOTH.

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S&W Accumulator

I like conversion barrels and have been doing them for years. It
started with the Glock 22 & 23. Then went to the SIG 226-229.

My son talked me into getting the 40 Shield. They run by just
swaping the OEM 40 S&W for an OEM 9mm barrel. Doing them
was easy and relatively cheap.

I need a TR Enabling .357 SIG Shield barrel and wish somone
would make them for the KAHR's, cause I would do them too.

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never get out of the boat