40 cal to 9mm conversion
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scattershot
Member
They'll work occasionally, but not dependably enough to fool with. The conversion barrel works nicely, though, with the proper mags.
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No, the .40 magazines will not work, you will need 9mm magazines
MecGar is the OEM contract manufacturer of S&W M&P magazines. They do not sell them under the MecGar brand at retail. Just get the S&W OEM magazines at the best deal you can find. Brownells sent me an ad they had them on sale.
IMHO, ProMags have serious QC problems.
http://smith-wessonforum.com/smith-wesson-semi-auto-pistols/504653-promag-any-good.html
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Greg Cote LLC
scattershot
Member
Second Greg Cote, and Mec-Gar mags are excellent.
retired2006
Member
I have used these, they are very good, actually like them BETTER than factory. Available from Brownells, which also has the S&W factory mags on sale for 22.00 !
S&W M&P 9MM 17-ROUND MAGAZINE | Brownells
S&W M&P 9MM 17-ROUND MAGAZINE | Brownells
OK, here we go!!!
Bear in mind I live in CA where we are restricted to 10 rounds.
I bought some Promags for my FS. Frankly, they are ****! If you spend a few minutes on your favorite search engine, you'll find tons of complaints.
The spacing on the feed lips of the mags on a .40 are a bit wider than on a 9. This can cause feeding problems. For range use only, you *may* be OK. I would not squeeze the lips closer (OK, that sounds improper) since you may use them for .40 and possibly cause problems there.
Greg Cote is an outstanding vendor.
If you proceed with a barrel swap, please be careful to keep .40 with .40 and 9 with 9. Again, you can search to see the results of shooting a 9mm out of a .40 barrel.
Bear in mind I live in CA where we are restricted to 10 rounds.
I bought some Promags for my FS. Frankly, they are ****! If you spend a few minutes on your favorite search engine, you'll find tons of complaints.
The spacing on the feed lips of the mags on a .40 are a bit wider than on a 9. This can cause feeding problems. For range use only, you *may* be OK. I would not squeeze the lips closer (OK, that sounds improper) since you may use them for .40 and possibly cause problems there.
Greg Cote is an outstanding vendor.
If you proceed with a barrel swap, please be careful to keep .40 with .40 and 9 with 9. Again, you can search to see the results of shooting a 9mm out of a .40 barrel.
Raisin
Member
Try these guys for new magazines. Good prices on S&W magazines.
Smith & Wesson S&W M&P Shield 9mm Luger 8-Round Stainless Steel Factory Magazine
Smith & Wesson S&W M&P Shield 9mm Luger 8-Round Stainless Steel Factory Magazine
Thanks for all the answers and advice , this is an excellent site . I wish I would've ordered mags when I ordered the barrel and saved on shipping. Ill check these leads and get back when I do the swap . Barrel should be in the 20th.
LD-Ordie
Member
I bought my barrel and a factory mag on eBay for less than I could find from the big distributers, free shipping too. A great conversion to do, also did it on my G27
