For those of you looking to convert your M&P 40C to 9MM, Midway has genuine S&W 9MM barrels in stock at a very reasonable price. I'm sure they won't last long!

You're right, they're already sold out. Thanks for the heads up.

The full size is also in stock (for now):
Smith & Wesson Barrel S&W M&P 9mm Luger 4.25

I was able to get one. You have to be fast and have stuff you want to buy already on your shopping cart. I had and item in my cart that gave me free shipping on my order. The FS barrels are also available.

Smith & Wesson Barrel S&W M&P 9mm Luger 4.25

And full size is gone as well.

If you missed out this time around, you can backorder the compact barrel. Unfortunately you can't backorder the FS barrel.

I got an email saying my backordered one has shipped. I think it was about exactly two weeks since I ordered it. I look forward to trying it out.

Two weeks? I had one on backorder since last July. It just shipped today.

There was a time recently when S&W was back ordered on barrels, especially compact ones. They had barely enough to put in their new pistols with very few spares. Least ways that's what they told me when I tried ordering directly from S&W as well as firearms stores with internet sales.

__________________
Former USN, Retired US Army

I got my M&P 9c barrel yesterday. I am not sure what to think. I have read that others have had good results by putting these in a M&P 40c, but the fit leaves something to be desired. There is definitely more side-to-side slop in the fit, with the narrower barrel extension of the 9mm. I cannot be certain of there is no risk to putting premature wear on something.

I don't plan to shoot it. It would just be for ammo emergencies. In fact, I may just sell it and use the money toward the purchase of a smaller 9mm like a KelTec or SCCY.

Hundreds, maybe thousands of people have run 9 barrels in 40 slides with no issues. But you will have no problem selling that barrel. You might even make some money on it.

I understand that many people have done it successfully. That does give me a great deal of confidence that it will work. I just wonder about long-term effects of firing it like that a lot.

Well then, maybe a Storm Lake barrel is in your future. Do your research, not always plug n play.

Yeah, I sometimes obsess about details. I have about 300-400 rounds of 9mm ammo sitting around. When I rack the slide, the barrel ends up in the center. It is free to move a little, but it ends up near the center, pretty consistently. Maybe there is nothing to be concerned about. I will try it out and see what accuracy I get. Maybe I will love it.

I think it very likely that a Storm Lake 357 SIG barrel is in my future.