357 & 45 Caliber Exchange kits - SIG Talk
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357 & 45 Caliber Exchange kits

This is a discussion on 357 & 45 Caliber Exchange kits within the P250, P320, & P320 X-5 Pistols forums, part of the SIG Sauer Pistols category; In the Sig Store it seems they don't offer a 357 kit for the P320 subcompact - not even listed as out of stock the ...


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P250, P320, & P320 X-5 Pistols P250, P320, & P320 X-5 Pistols

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Old 06-18-2016, 08:24 AM   #1
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357 & 45 Caliber Exchange kits

In the Sig Store it seems they don't offer a 357 kit for the P320 subcompact - not even listed as out of stock the way it is for the other sizes. While in theory you should be able to buy a "complete" SC in 357 , don't think I've every seen one available.

They say the 45 caliber is coming "soon" for all sizes

Interestingly, they do offer caliber x-change kits, in both 357 & 45 caliber, for the P250 subcompacts.

Why is that?

Last edited by EdJG; 06-18-2016 at 09:09 AM.
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Old 06-18-2016, 11:28 AM   #2
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Get a 40 kit and a 357 barrel if that is what you really think you want. If you check the sig web store, They list a P250/320 barrel for the full size on the P320 page then also list a P250SC on the P250 page. That whole debate about if P250 barrels and P320 barrels are able to swap begins again.....

P320 Barrel Page..
Barrels - Parts

P250 Barrel Page..
Barrels - Parts

As for 45ACP, the FCU (9/357/40) vs (45) have different dimensions for the larger 45ACP sized magazines and placement of the ejector.

Last edited by Eldos1; 06-18-2016 at 11:39 AM.
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Old 06-18-2016, 02:07 PM   #3
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[QUOTE=Eldos1;790161]Get a 40 kit and a 357 barrel if that is what you really think you want. If you check the sig web store, They list a P250/320 barrel for the full size on the P320 page then also list a P250SC on the P250 page. That whole debate about if P250 barrels and P320 barrels are able to swap begins again.....

/QUOTE]

I'm looking at the P320 Subcompact and they're not offering an x-change kit in either the 40 or 357. Are you suggesting the caliber x-change kit for the P250 will work with the FCU in the P320??? In any event the cost for an x-change kit ($400) and another barrel ($199) pays for a new gun!
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Old 06-18-2016, 03:52 PM   #4
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A P250 x-change kits will not work with a P320.
A P250 slide is hammer fired.
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Old 06-18-2016, 08:46 PM   #5
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Quote:
Originally Posted by Michael64 View Post
A P250 x-change kits will not work with a P320.
A P250 slide is hammer fired.
Correct...





Looks like subcompact kits for 40 s&W or 357 not out, but I have seen 40 S&W subcompact guns.
P320 in 40S&W. Have not seen one on 357sig yet.
https://www.osagecountyguns.com/fire...sc-40-bss.html

Then get a barrel for a P250 Subcompact in 357sig.... If you go look at the post #2 links, the P320 barrel on the sig websight says "P320/P250 357sig Full" Logic would say then a P250 subcompact barrel would also be the same compatible.

The base of the cartage on a 357sig and 40 S&W are the same, so the that is why you can just swap a barrel on a 40 s&W and 357 sig. The SLIDE then is compatible for 357sig

You can then sell the fire control unit from the second pistol if you do not want it for around $200 to get some money back on the project. The FCU is the "Firearm", so you will need to fallow laws to sell/ transfer it.

Did not say it was cheep, but this is how you can get a 357sig subcompact.


Another more easy option would be to get a Compact in 357sig and use a subcompact frame. You the get a slide/barrel that is about .5" longer than a subcompact.

Last edited by Eldos1; 06-18-2016 at 09:03 PM.
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Old 06-19-2016, 04:08 AM   #6
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Quote:
Originally Posted by Eldos1 View Post
Correct...
Looks like subcompact kits for 40 s&W or 357 not out, but I have seen 40 S&W subcompact guns.

Another more easy option would be to get a Compact in 357sig and use a subcompact frame. You the get a slide/barrel that is about .5" longer than a subcompact.
I'll take the easiest route - wait for the SC X-change kits to come out.
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Old 07-05-2016, 12:58 PM   #7
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Has anyone heard when the 45 auto x-change kits will be available? I have the P320 9mm compact and I want to purchase the 45 auto kit for it.
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Old 07-05-2016, 01:58 PM   #8
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Quote:
Originally Posted by catxr768 View Post
Has anyone heard when the 45 auto x-change kits will be available? I have the P320 9mm compact and I want to purchase the 45 auto kit for it.
The 9mm fire control group has a different ejector bar location than the 45 ACP Fire Control. The ejector is part of the fire control unit. This is part of "why" they can not swap. Another issue is that the 45 acp magazines are larger and there would be alignment issues.

So, 9/357/40 can swap. Same Fire control
45 ACP, you need a different gun/fire control
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Old 07-05-2016, 05:59 PM   #9
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Quote:
Originally Posted by Eldos1 View Post
The 9mm fire control group has a different ejector bar location than the 45 ACP Fire Control. The ejector is part of the fire control unit. This is part of "why" they can not swap. Another issue is that the 45 acp magazines are larger and there would be alignment issues.

So, 9/357/40 can swap. Same Fire control
45 ACP, you need a different gun/fire control
Thats a bummer, their website is misleading in the fact that you actually can't x-change with all calibers. I must admit the P320 9mm is the best shooting gun I have and love the gun. Just no 45acp unless I get a separate gun.
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Old 07-07-2016, 10:03 AM   #10
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Quote:
Originally Posted by catxr768 View Post
Thats a bummer, their website is misleading in the fact that you actually can't x-change with all calibers. I must admit the P320 9mm is the best shooting gun I have and love the gun. Just no 45acp unless I get a separate gun.


It shoots .40 extremely well too if you want a bigger round.


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Old 07-19-2016, 02:24 PM   #11
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Would the sights need to be changed for 357 vs 40?
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Old 07-19-2016, 04:09 PM   #12
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I haven't shot .357 SIG but most have said that the POI for .40 S&W is higher for that of .357 SIG out of the same pistol.

SIG recommends #6 front and #8 rear sights for .40 S&W and #8 sights front and rear for 9 mm Luger and .357 SIG.

The #6 front sight is taller than the #8 front. With SIG's numbering system a higher number sight, front or rear, brings the POI up, so replacing a #6 front with a #8 front will raise the POI relative to the POA.

At shorter range I doubt there will be much difference.
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Old 07-19-2016, 04:10 PM   #13
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Quote:
Originally Posted by catxr768 View Post
Thats a bummer, their website is misleading in the fact that you actually can't x-change with all calibers. I must admit the P320 9mm is the best shooting gun I have and love the gun. Just no 45acp unless I get a separate gun.
Yes. Unfortunately, SIG did not deliver on their promise when the .45 ACP fire control unit came out.
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