Guess it's about time for this wish topic to resurface again ... 
Believe it or not, there are some 10mm enthusiasts working at S&W. They'd like to see another 10mm made by S&W, too.
I've asked about the potential for a 10mm in either the SW1911 line or the M&P line (in the .45 frame/slide size). I'd not hold my breath.
While some company folks would like to see it, there are a couple of immediate problems preventing it from being seriously considered.
First, like it or not, the ammo sales for the 10mm cartridge, as reported by the major commercial ammo companies, is still insufficient to make investing in a new caliber model worthwhile. (Hint. You want them to report more 10mm ammo sales? Buy more 10mm from the big ammo companies so they can report it.)
Yes, I know, someone is bound to offer the names of some of the smaller "custom" ammo companies who have been making 10mm to fill the void left by the big names. They cater to a small group of enthusiasts and aren't able to match the production numbers offered by the big names.
Like it or not, the 10mm remains a viable enthusiast cartridge for non-LE/Gov/Mil ... and a lot of those enthusiasts seem to be more interested in buying components to reload.
Hunters? Sure, except how often does the company make a M610 production run to try and keep up with all the demand, right? And that's a gun that doesn't require any further R&D ... or MAGAZINES (which they can't get produced in sufficient numbers just for their regular calibers).
Secondly - and this probably ought to be the number one reason - they're selling every M&P pistol they can even hope to make in the regular calibers. They're back-ordered farther than they can see. Then, there's the not inconsequential consideration that they're REALLY back-ordered with their magazine vendors, and that's just for what they could use & sell TODAY, if they could get their orders received.
Sometime in the middle 2000's I asked a Glock rep how many .357 models they were selling to LE. He said they didn't give those figures to the LE sales reps ... but that he'd asked around the company on his own and learned they supposedly produced something like 1 pistol chambered in .357 for every 2500 pistols made in other calibers (but he didn't know if that was for each caliber, or combined numbers compared against the 10mm guns). Maybe so. He also mentioned that it was his impression that they sold less 10mm's than .357's.
Dunno. Maybe so. Doesn't really matter to me.
Since I'm a LE Glock armorer, I've only seen a very few G20's.
One was back in the Fall of '90, and it was an early production sample brought around by a Glock rep. He provided Norma ammo so we could try the gun. (He said at that time that the G21 .45 we were all anxious to see wasn't yet ready for production, and was still getting some finishing touches.)
The next one I saw was more than 10 years later, owned & carried by a private citizen.
As much as I think the 10mm never received the appreciation it ought to have received, or wasn't developed to its potential for both heavy hunting loads and reduced bullet weight personal defense loads, I'm not holding my breath to see a 10mm produced in the SW1911 or M&P lines tomorrow.
FWIW, I was told by one of the company's 10mm enthusiasts that I'd see a SW1911 chambered in .40 S&W long before I would a 10mm model (because they had a .40 model in development).
You get the big ammo companies to start making a wider variety of commercially loaded 10mm ammo, AND you folks start buying it by the case, AND the ammo companies start reporting increased sales, then you'll probably get S&W's attention for making a gun to meet that market demand.
P.S. - While you're at it, I'd really like to see the .41 Magnum brought back.
Luck to you.

Believe it or not, there are some 10mm enthusiasts working at S&W. They'd like to see another 10mm made by S&W, too.
I've asked about the potential for a 10mm in either the SW1911 line or the M&P line (in the .45 frame/slide size). I'd not hold my breath.
While some company folks would like to see it, there are a couple of immediate problems preventing it from being seriously considered.
First, like it or not, the ammo sales for the 10mm cartridge, as reported by the major commercial ammo companies, is still insufficient to make investing in a new caliber model worthwhile. (Hint. You want them to report more 10mm ammo sales? Buy more 10mm from the big ammo companies so they can report it.)
Yes, I know, someone is bound to offer the names of some of the smaller "custom" ammo companies who have been making 10mm to fill the void left by the big names. They cater to a small group of enthusiasts and aren't able to match the production numbers offered by the big names.
Like it or not, the 10mm remains a viable enthusiast cartridge for non-LE/Gov/Mil ... and a lot of those enthusiasts seem to be more interested in buying components to reload.
Hunters? Sure, except how often does the company make a M610 production run to try and keep up with all the demand, right? And that's a gun that doesn't require any further R&D ... or MAGAZINES (which they can't get produced in sufficient numbers just for their regular calibers).
Secondly - and this probably ought to be the number one reason - they're selling every M&P pistol they can even hope to make in the regular calibers. They're back-ordered farther than they can see. Then, there's the not inconsequential consideration that they're REALLY back-ordered with their magazine vendors, and that's just for what they could use & sell TODAY, if they could get their orders received.
Sometime in the middle 2000's I asked a Glock rep how many .357 models they were selling to LE. He said they didn't give those figures to the LE sales reps ... but that he'd asked around the company on his own and learned they supposedly produced something like 1 pistol chambered in .357 for every 2500 pistols made in other calibers (but he didn't know if that was for each caliber, or combined numbers compared against the 10mm guns). Maybe so. He also mentioned that it was his impression that they sold less 10mm's than .357's.
Dunno. Maybe so. Doesn't really matter to me.
Since I'm a LE Glock armorer, I've only seen a very few G20's.
One was back in the Fall of '90, and it was an early production sample brought around by a Glock rep. He provided Norma ammo so we could try the gun. (He said at that time that the G21 .45 we were all anxious to see wasn't yet ready for production, and was still getting some finishing touches.)
The next one I saw was more than 10 years later, owned & carried by a private citizen.
As much as I think the 10mm never received the appreciation it ought to have received, or wasn't developed to its potential for both heavy hunting loads and reduced bullet weight personal defense loads, I'm not holding my breath to see a 10mm produced in the SW1911 or M&P lines tomorrow.
FWIW, I was told by one of the company's 10mm enthusiasts that I'd see a SW1911 chambered in .40 S&W long before I would a 10mm model (because they had a .40 model in development).
You get the big ammo companies to start making a wider variety of commercially loaded 10mm ammo, AND you folks start buying it by the case, AND the ammo companies start reporting increased sales, then you'll probably get S&W's attention for making a gun to meet that market demand.

P.S. - While you're at it, I'd really like to see the .41 Magnum brought back.

Luck to you.

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