Tresna Defense has a 9mm carbine that comes in S&W M&P magazine platform. They already have a Glock version out and is available now as a rifle or pistol. If you are Law Enforcement, they make a full auto SMG.
Jose Jaureguizar, the CEO of Tresna, brought out his new JAG9MP for us to shoot at the Big 3 East last week. We used Promag 32 rd M&P9 mags through the SMG. Tresna does advertise that the bolt does stay open on the last round. However on this prototype, the bolt would lock open on the second to last round fired, leaving the last round in the magazine. We chalked this up to the fact that it was a Promag magazine. I did not try it with a standard 17rd S&W M&P magazine to see if the problem was isolated to the Promag hicaps.
The JAG9G BU rifle retails for $1199.95 and the pistol retails for $1299.95. The increase is due to the handguard, according to Jose.
The Jag9 carbines will work with hicaps all the way down to the subcompact magazines like the Glock 26/27. I do not know if the M&P variant will work with M&P9C mags but I suspect it can if the Glock version can use the 26 magazine.
The lower receiver is a milled billet dedicated lower and sports a flared mag well. For more information check out their website.