[A45ACP]

I'm throwing this out for some added brain power & knowledge. I love my 45 ACP 24/7 Pro. I also want a compact 10mm of some sort. Looking at both the 4" S&W M&P 2.0 ($590) or the Springfield XD-M Compact ($640). I can shave some $ off due to being retired LE, but after reading about the Taurus TH10 here, as well as seeing some were actually listed on some vendor sites, I got to wondering:

What if it was possible to use the 24/7 45 ACP as a platform for the 10MM? The Glock 20/21 and 29/30 do so with minor parts interchange.

What I'd like to do is get my hands on the TH10 15 round mag and see if it will physically fit into the 24/7 well.
That's the relatively easy part. If that picture is accurate, it's unlikely the mag catch would function, but a slot could be cut into it if everything else fit OK.

The real challenge would be getting the barrel to see if it would interchange so far as mounting goes. Length is irrelevant as it could be cut to fit (I've done this on my Glock projects). The TH10 at this point is made from unobtanium , so parts are not available.

Other factors/thoughts-
The 10mm bullet is the same diameter as the 40, the case is just longer to where it won't fit into a 40 mag. I've read about people firing 40 rounds in a 10mm, but have not tried it. My research shows the 10mm case length is .992" while the 40 is .850" for a difference of .142".

A possible workaround, albeit possibly expensive-
Find a 24/7 40 barrel & slide (? on needing the slide), and have the barrel rechambered for the 10mm round. Presuming the mag will fit, this could work. I read some posts from circa 2006 where folks with other brand guns had this done for around $50.

I did try putting 10mm rounds in my 24/7 45 mag. The lips are too wide, so they won't stay in place.

Question for knowledge base-
What are the differences between the 24/7 45 and 40 frame & slide? It was sold in several calibers, but since I only have one, I don't know what all interchanges.

Thanks for any constructive input.

 

[MoKen]

Firing 40, while possible is relying on the extractor to head space the case in a 10mm is far from being ideal.

 

[Caveman jim]

Just buy the gun, no need in experimenting and possibly ruining your day.

 

[A45ACP]

Thanks. I agree firing a 40 in a 10 not something I'd care to do. My exercise here is about converting existing parts (and possibly a mag possibly in existence) to properly chamber and fire the 10mm. I see a number of 40 Pro slides & barrels on eBay. The lugs look identical to the 45 barrel on mine, Genitron shows the outside dimensions are the same for both calibers. It looks like the mag may be the main holdup here. I'd like to have a 40 mag to see how it fits in my 45 frame.

I was hoping someone here may have both guns and could answer that. It looks like the 40 mags are still available in a few places for about $30 each. Best case scenario, it slides right into the 45 well, and has some type of removable block for the shorter round. Worst case, the mag wells are different. I'll have to look & see if anyone has either frame as a 3D file- which is unlikely.

 

[A45ACP]

Just buy the gun, no need in experimenting and possibly ruining your day.

That's not how I roll. Below is a 13+1 G21/30 45 ACP hybrid I built by modding a 3D file as well as the barrel & RSA. It now has a dot optic & runs great. It's a huge grip though, still prefer my 24/7 over it.

 

[Caveman jim]

Good luck with that.

 

[jspdrcrmach5]

I wouldn't modify a gun to shoot a higher pressure cartridge, I just don't like the thought of one blowing up in My face.
I'm not that good looking to start with and I certainly don't need to look worse.

 

[? Marquis]

If I had to pick a cartridge that's expensive, hard to find in quantity and has the fewest available options on an incapacitation index...it'd be the 10mm.

 

[A45ACP]

I wouldn't modify a gun to shoot a higher pressure cartridge, I just don't like the thought of one blowing up in My face.
I'm not that good looking to start with and I certainly don't need to look worse.

SAAMI max pressure specs for all 3 calibers:
40: 35,000
10: 37,500
45: 21,000

Yes, the 10mm is a lot more than the 45, but the same gun was offered in 40, which is only 7% less pressure than the 10. From what I've read and my work with the 29/30 Glocks, I think it's a matter of using the proper recoil spring. Fun fact- the OAL of the 24/7 Pro is within .2mm of the 3rd Gen G20, which has a lot of spring options. Working out a bushing to make up for the end rod difference. I did try a Gen 3 (single) spring/rod with the Gen 3 / Gen 4 bushing and it cycled OK.

 

[A45ACP]

If I had to pick a cartridge that's expensive, hard to find in quantity and has the fewest available options on an incapacitation index...it'd be the 10mm.

Not exactly constructive, but here's some help to get you past the glass being half empty:

10mm S&B FMJ $20.84 for 50 Same brand & vendor, 45 ACP is $2 more, while 9mm is $7 less.
10mm S&B JHP $22.01 for 50

$12.99 flat rate shipping. It also uses the same dies for reloading as the 40, so even more options for hand loaders.

Next issue!

 

[A45ACP]

I messaged a 40 owner & found the mag well is the same dimension, 24x35 (EDIT- this is erroneous, the 40 magwell is smaller). If I can get an OEM 40 mag I'll need to see if the 10mm round will fit in it. I found that a newer less used 45 ACP mag does retain 10mm dummy rounds, and they cycled thru my barrel. It may just be a matter of tightening the opening up top.

 

[DeltaBravoKS]

This is an interesting story line and I hope you keep it going (assuming you continue with the quest). I'm not much of an experimenter, but I applaud the spirit. Too bad that some feel the need to require justification, but if experimenters never experimented, we wouldn't have ANY guns!

I assume you know the PT24/7's were on the settlement recall list, so I'm guessing any parts are hard to come by--maybe even harder than the average Taurus.

 

[A45ACP]

This is an interesting story line and I hope you keep it going (assuming you continue with the quest). I'm not much of an experimenter, but I applaud the spirit. Too bad that some feel the need to require justification, but if experimenters never experimented, we wouldn't have ANY guns!

I assume you know the PT24/7's were on the settlement recall list, so I'm guessing any parts are hard to come by--maybe even harder than the average Taurus.

Thanks! I feel exactly the same way as to experimenting. I've done the same type of things with cars for the past 20+ years, and now that I'm learning about 3D printing I'm enjoying doing this with guns.

Yes, I'm well aware of the recall. I refused to comply due mainly to no equivalent model (45 ACP) being available, and 2) It wasn't broken (still isn't), so no need to fix it. Ran into a similar thing modding cars when Cash for Clunkers hit- really spiked prices of junkyard engines & other parts.

 

[A45ACP]

Got a good deal on a 24/7 Pro 40 slide, barrel and RSA, so this is moving forward. I'll try to snap some pics as I make progress. Main thing now is finding a local gunsmith that can ream the chamber.

 

[DeltaBravoKS]

Thanks! I feel exactly the same way as to experimenting. I've done the same type of things with cars for the past 20+ years, and now that I'm learning about 3D printing I'm enjoying doing this with guns.

Yes, I'm well aware of the recall. I refused to comply due mainly to no equivalent model (45 ACP) being available, and 2) It wasn't broken (still isn't), so no need to fix it. Ran into a similar thing modding cars when Cash for Clunkers hit- really spiked prices of junkyard engines & other parts.

Yeah, I have a few "recall" models with no plans to part with them. I've never parted with any gun I've purchased. I've toyed with buying a 3d printer as well, but just don't have the time to tinker at the moment.

Sorry about the cash for clunker thing making things more expensive. However, we got a great deal on a new car for my son by trading in an old soon-to-fail clunker.

 

[MoKen]

If I had to pick a cartridge that's expensive, hard to find in quantity and has the fewest available options on an incapacitation index...it'd be the 10mm.

I guess you haven’t seen the skyrocketing popularity recently of the 10mm?
It’s no more expensive than most others.
Many options at our local gun stores.

 

[? Marquis]

I guess you haven’t seen the skyrocketing popularity recently of the 10mm?
It’s no more expensive than most others.
Many options at our local gun stores.

9mm, 45 and 40 all have far more choices in type of bullet and are less expensive. But hey, whatever makes one happy...it's all good.

 

[MoKen]

9mm, 45 and 40 all have far more choices in type of bullet and are less expensive. But hey, whatever makes one happy...it's all good.

Doesn’t really matter to me I handload. And my 10 is certainly no more expensive that my 44magnum, 357/38, 45AP or 9mm considering volume bid lead and powder.

 

[A45ACP]

Well I've reached out to a couple of local places that claim to be gunsmiths & no reply. As far as online places go, a zero there as well. One place has not replied, while another said that's not a service they offer.

YouTube to the rescue, it looks like for the minor amount of metal being removed, this could be done in my shop. Finish reamers are around $90 on Midway or Brownells, or I could rent a reamer & gauge set for around $50. I'm leaning towards buying the tool, as a future plan is an XDM in 45 and I'd like to add a 10mm barrel to it at some point.

I pulled my P80 G23 (40) and hybrid 29X (10) apart so I could see how rounds sit in the chambers. I'll attach a couple of pics that show the differences. The first one has both rounds in the proper chamber, then the second one has them swapped. The 40 is not visible, while the 10 sticks out. I used a digital caliper and measured a case length difference of around .140".

The used parts should be here Thursday so I can have another update after that. The only thing I'm lacking at this point is an actual Taurus 40 mag to test, but I have a lead on one. I may pick up a set of NDZ springs & steel rod for a G20 Gen 4 so I can adjust as needed to tune the recoil. Looks like I can turn down the supplied bushing from 14mm to 13mm and it should fit into the Taurus slide.

 

[A45ACP]

EDIT- The G20 4th gen RSA sold by Centennial Defense Systems is a perfect replacement for the OEM Taurus one, and is available in different weights. I'll leave the below as-was for reference.

Some pics about the recoil spring as tested in my 45. I'll run some rounds thru it later today to confirm operation:
First one is the Glock Gen 3 / Gen 4 bushing used for when a Gen 3 single RSA is used in a Gen 4 slide (larger bottom opening). These run around $10, and are about 14mm in OD. The OD of the smaller side fits into the Taurus slide, but could be slightly larger. I ground the large side down to 13mm. If this is an issue, I plan on creating a 3D file for it and having one printed commercially in metal.

Second picture shows the bushing in the slide w/o the RSA in place:

Third one shows the RSA in place bottom view.

Fourth one shows the RSA in place front view. Looks nearly flush.