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P320 modularity... is there a chart? Login/Join 
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Picture of vthoky
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Hi, all. I'm really liking my P320sc, and have started to consider "accessorizing." My difficulty right now -- like usual -- is that I don't have enough knowledge.

Is there a master chart of some sort that tells me which grips, slides, and so forth can be interchanged with which models?

I've looked around Sig's web site and not found it. Thank you.



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Posts: 9125 | Location: Hokie Nation! | Registered: July 15, 2007Reply With QuoteReport This Post
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No chart that I know of.

Basically, all the 9mm, .40, and .357 slides and grips are interchangeable and use the same FCUs, while the .45s are separate.

Some combinations are goofy, like a Subcompact slide on a Full Size frame (or vice-versa), but they technically will function. The most common combinations are:

Full Slide/Full Grip
Full Slide/Carry Grip (slide hangs off the front a little)
Full Slide/Compact Grip (slide hangs off a little)
Compact Slide/Carry Grip
Compact Slide/Compact Grip
Compact Slide/Subcompact Grip (slide hangs off a little)
Subcompact Slide/Subcompact Grip

The Full Size and Carry grips use Full Size magazines. The Compact Grip can use Compact (flush) and Full Size magazines, but the longer mags will stick out the bottom of the grip. Similarly, the Subcompact Grip can use Subcompact (flush), Compact, and Full Size grips, but the longer mags will stick out.

There are X-Grip adapters that will fill the gap left when using the longer magazines in the shorter grips.
 
Posts: 23104 | Location: Northwest Arkansas | Registered: January 06, 2008Reply With QuoteReport This Post
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Here are some example photos I posted in another thread. All are 9mms.

Full Size Slide on Black Carry Grip - 17+1 rounds


Compact Slide with Black P320 Carry grip - 17+1 rounds


Compact Slide with OD Green P320 Compact grip - 15+1 rounds


Compact Slide with FDE P320 Subcompact railed grip - 12+1 rounds



P320 Carry with extended magazine - 21+1 rounds


P320 Compact with Full Size/Carry magazine and X-Grip adapter - Same grip length as the Carry - 17+1 rounds


Compact Slide on Subcompact grip with Compact magazine and X-Grip adapter - Same grip length as the Compact - 15+1 rounds
 
Posts: 23104 | Location: Northwest Arkansas | Registered: January 06, 2008Reply With QuoteReport This Post
Rule #1: Use enough gun
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Factory configurations...




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Posts: 14636 | Location: Birmingham, Alabama | Registered: February 25, 2009Reply With QuoteReport This Post
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Those who have tried it say that the .45 ACP FCU will work with the 9mm, .40 S&W, 357 SIG slides, barrels, and magazines. SIG does not approve this, however, because apparently using the .45 ACP with the smaller calibers will disable the magazine disconnect feature that prevents take down of the pistol unless the magazine is removed.

If you have the subcompact model, it probably came with the small grip module. You will know this if the grip module lacks a rail and has a rounded trigger guard. You could easily switch to a medium grip module if you wanted an accessory rail and squared off trigger guard (and fatter grip).

You can use magazines made for the compact and full-size P320 of the same caliber in your pistol, and use X-Grip magazine extender sleeves with the compact sized magazines.

The only grip modules that will fit the subcompact slide without modification are subcompact grip modules. You could, however, take a compact grip module and cut off the portion that overhung the subcompact slide.
 
Posts: 371 | Registered: March 07, 2008Reply With QuoteReport This Post
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quote:
Originally posted by pblanc:
The only grip modules that will fit the subcompact slide without modification are subcompact grip modules. You could, however, take a compact grip module and cut off the portion that overhung the subcompact slide.


As I mentioned earlier, unmodified Compact/Carry/Full Size grips will technically work with the Subcompact slide. They just look really goofy.




Similarly, the Full Size slide works on a Subcompact frame, just with a gap on the underside where the recoil spring is exposed.


(Yes, I know a couple of those are P250s, but the modularity works the same, and I couldn't find example photos of P320s.)
 
Posts: 23104 | Location: Northwest Arkansas | Registered: January 06, 2008Reply With QuoteReport This Post
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Yes, the subcompact P320 upper will function on an unmodified compact or even full-sized grip module. But it looks pretty damned silly, and I think most folks would choose to modify the grip module by cutting off the overhang. Those who have done so say it is not difficult to do so, and the photos I have seen of the modified grip modules look pretty good.

I have read that SIG does not actually mold a separate grip module for the carry model (compact slide on full length grip module) but actually cuts down full-size grip modules, but I don't know if that is true.
 
Posts: 371 | Registered: March 07, 2008Reply With QuoteReport This Post
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thanks for all the combo pictures.
I learned the 45 gun bought first can have all the cals 357 40 9 45 .
 
Posts: 619 | Location: GA | Registered: September 03, 2013Reply With QuoteReport This Post
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Thanks, all. I have some studying to do.

Seems like I can turn my .40 subcompact into a 9mm SC or even a compact if I want to. Neat!



Support our troops, and our veterans.
Go Hokies!
New favorite quote from the golf course: "It's not the club, son."
 
Posts: 9125 | Location: Hokie Nation! | Registered: July 15, 2007Reply With QuoteReport This Post
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