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320 Compact used with Sub Compact Grip module questions

This is a discussion on 320 Compact used with Sub Compact Grip module questions within the P250 & P320 Modular Pistols forums, part of the SIG Sauer Pistols category; Hello everyone, I am new here and I am heavily considering the 320 Compact as my next purchase, and my first Sig! I am wanting ...


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P250 & P320 Modular Pistols P250, P320, and Exchange kits

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Old 03-17-2017, 04:53 PM   #1
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320 Compact used with Sub Compact Grip module questions

Hello everyone,

I am new here and I am heavily considering the 320 Compact as my next purchase, and my first Sig!

I am wanting to "upgrade" my 9mm carry from my Taurus Millennium G2 to something more premium. And then retire the Taurus to backup home defense (since trade in value is only 100 bucks.)

I was wondering if anyone can tell me of any reasons NOT to purchase the compact first, then spend the $40 on the Sub compact grip for use when i want a smaller print? I am aware that the slide is a bit longer than the grip, but I actually think that looks cool and to my knowledge it does not effect function of the weapon.

Also does anyone here use Alien gear holsters while their compact is mounted to a sub compact grip? Ive heard that when people use this setup that the gun fits perfectly into holsters designed for the compact? Is this true of Alien gear shells? If someone can answer that question it would be amazing.

I would appreciate any advice or thoughts you guys can offer, I dont wanna make a major purchase and then regret it.
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Old 03-17-2017, 05:20 PM   #2
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You will likely get a lot of differing opinions about which model to start with. I personally prefer the carry model, since its the same slide as the compact but with a full size mag capacity. However, there was a similar thread going recently, and I think the most popular recommendation was the compact.

In terms of cost consideration, I think the most compelling argument would be to start with the subcompact and just buy a 15 round mag with x grip adapter. That way you get the conceal-ability you want, and the potential for higher mag capacity without having to buy another mag AND another grip module.
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Old 03-17-2017, 05:22 PM   #3
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Originally Posted by stlmia View Post
You will likely get a lot of differing opinions about which model to start with. I personally prefer the carry model, since its the same slide as the compact but with a full size mag capacity. However, there was a similar thread going recently, and I think the most popular recommendation was the compact.

In terms of cost consideration, I think the most compelling argument would be to start with the subcompact and just buy a 15 round mag with x grip adapter. That way you get the conceal-ability you want, and the potential for higher mag capacity without having to buy another mag AND another grip module.
True, but I like the idea of carrying the compact as well. I figure the compact is very close in size to my current Taurus, so purchasing the compact first makes sense because if i like carrying that, then im good to go anyway. I also want a full grip for range days, all 3 fingers, which the compact gets you.
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Old 03-17-2017, 05:34 PM   #4
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In terms of grip length, the subcompact with a 15 round mag and an x grip adapter is the same as a compact (with the same 15 round mag). Both would give you a three finger grip.

Personally, I agree with your thinking. If I were you, I would go for the compact over the subcompact because I think it balances better. I just want to point out the price difference based on what you are looking for.

Starting with the subcompact, you would only need a 15 round mag (about 40 new) and an x grip adapter (about 10).

Starting with the compact, you would need a 12 round mag (about 40), and a subcompact grip module (about 40).
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Old 03-17-2017, 06:42 PM   #5
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No matter which grip size you choose, compact or carry, I recommend you start with the compact slide. If you mount the compact slide on the subcompact grip module you will be amazed at how little excess slide you have while achieving a more easily concealed grip.

I have owned 320s since they were first introduced and now have more than I should maybe but I love to play with them. I have done what many have done and cut down a compact (15 round) grip to match the length of the subcompact slide. IMO that wound up being kind of silly. If I want the compact grip I might as well use the compact slide given its only slightly longer length. If you want to carry the gun then the subcompact grip module will show less and, if mounted on a compact slide, give a slightly longer sight radius.

I have 5 320s and 8 spare grip modules along with two extra FCUs. I play around a lot with different configurations. For me, and I emphasize for me, the compact length slide gives the most flexibility. The full size has become a target model for the range and the subcompact rarely leaves the safe. Again, that is me.
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Old 03-17-2017, 06:57 PM   #6
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Search here in the P320 zone. One of the guys has posted several photos of the longer model slides on smaller grip frames in a couple of threads (I actually think it should be a sticky). What you are considering does work.
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Old 03-17-2017, 07:28 PM   #7
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I have a compact plus a subcompact grip module. I also have the full size mags and x-grip adapters for use in the compact. Very versatile setup for me. I prefer the slightly longer barrel of the compact when using the sub frame.

I can't really help with the holster question except to mention that my Stealthgear made for the compact works fine with the subcompact frame. I imagine the AG would fit also.
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Old 03-17-2017, 07:57 PM   #8
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Welcome !

I also have a Taurus Millennium GII 9mm. They are neat carry pistols because of their slimness and weight. They also have good firepower due to their round count (12 +1). Accuracy is right on par with the GII as it is with the P320 9mm and my SP2022 9mm. Not long ago I shot a standing ground hog in our back yard at around 30 feet with my Taurus 9mm GII. It is thinner, shorter and lighter than either of my P320s.

The Millennium GII weighs 1 lb 11 oz fully loaded where the P320 Compact weighs 2 lbs +1oz full loaded, the carry not much more, 2 lbs +2 oz. The .45 ACP P320 weighs 2 lbs +4oz loaded. Don't seem like much, but I can definitely feel the difference of both weight and bulk (GII being thinner) than my SIG P320. I carry daily and have been carrying the Taurus GII in 9mm for several years.

Now that said, I would suggest the Carry or Compact. About 2 rounds difference, but it only adds about the difference of .20" on the overall height in the grip area for the carry. Getting a Compact grip module... good luck. If you stumble across a P320 in Compact, might be your best choice as they are seemingly hard to come by. Suggest Cabela's for starters.

I wish SIG would take a design idea from Taurus and mill out material from both sides of the top of the slide and round the slide areas like Taurus did. I have to hand it to Taurus about keeping the pistol rounded and lighter weight.

Also of note: I have seen forum reports on the internet about the case head separation of ammunition with the SIG P320. I am thinking that is more a reloading multiple times of the round rather than an issue, of sorts, with the actual pistol. I get a lot of blow back with my Federal 9mm FMJ range ammo (brass) and fitting a 9mm (or .45) in the barrels shows a lot of clearance. Probably SIG want's to make sure that it has a military combat functional barrel by having the chamber reamed to be a bit on the maximum size. it makes for easier loading and extraction when hot and/or dirty. With once reloaded ammo, that is not over the top high in pressure, or brand new (WHICH SIG recommends - warranty) I think you should never have an issue.
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Old 03-17-2017, 09:11 PM   #9
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Originally Posted by DCSig View Post
Search here in the P320 zone. One of the guys has posted several photos of the longer model slides on smaller grip frames in a couple of threads (I actually think it should be a sticky). What you are considering does work.
P320 Subcompact and Compact mix-n-match combos, sizes, holsters and observations.
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Old 03-18-2017, 04:44 AM   #10
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Thank you JeffS, that's it!
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Old 03-18-2017, 05:19 PM   #11
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Appreciate the insights given here. So many decisions to make.

My local shop has all 3 sizes available to rent. I am also considering the XD Mod 2 Subcompact, I like it a lot too and the deal that Springfield is running until June really good.

On my next day off I think im going to go rent and shoot both guns and then think about it some more.
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Old 03-18-2017, 07:39 PM   #12
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I bought a 9mm compact RX and also a compact 9mm caliber exchange and a bunch of grip modules in various sizes and colors. If I were you, I would buy the compact pistol and order a subcompact grip module. You can run a 12 rd, 15 rd with Xgrip to fill in the gap and a 17 rd mag, but that's a bit ridiculous IMO. The compact barrel and slide is only a little bit longer than the subcompact and it gives you a better sight distance with possibly better accuracy. Better yet, with the longer slide, you can convert to a compact, carry or subcompact. With the subcompact shorter slide and barrel, you are stuck with the subcompact grip modules. It leaves very little for modularity. Btw, I don't like the feel of the subcompact with 12 rd. magazine. The high bore axis make it feel very top heavy. Adding the 15 rd mag to the subcompact makes it feel much better. I doubt I'll ever use the 12 rd. mag in my subcompact. I'd rather carry one of my 9 or 10 rd (+1 config) single stacks 9mm pistols at that point.
I have the Alien Gear Cloak Tuck 3.0 IWB holster and I love it! I bought the one for a compact pistol, but it works fine with my current CCW setup -- compact slide and subcompact grip. I have other more expensive leather IWB holsters, but the Alien Gear is much more comfortable right out of the box. The leather ones are really nice, but it does take a while to break them in.
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Old 03-19-2017, 10:24 AM   #13
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Awesome. Glad to hear the alien gear works with that setup.
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Old 03-19-2017, 05:22 PM   #14
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Originally Posted by Scooter22 View Post
I bought a 9mm compact RX and also a compact 9mm caliber exchange and a bunch of grip modules in various sizes and colors. If I were you, I would buy the compact pistol and order a subcompact grip module. You can run a 12 rd, 15 rd with Xgrip to fill in the gap and a 17 rd mag, but that's a bit ridiculous IMO. The compact barrel and slide is only a little bit longer than the subcompact and it gives you a better sight distance with possibly better accuracy. Better yet, with the longer slide, you can convert to a compact, carry or subcompact. With the subcompact shorter slide and barrel, you are stuck with the subcompact grip modules. It leaves very little for modularity. Btw, I don't like the feel of the subcompact with 12 rd. magazine. The high bore axis make it feel very top heavy. Adding the 15 rd mag to the subcompact makes it feel much better. I doubt I'll ever use the 12 rd. mag in my subcompact. I'd rather carry one of my 9 or 10 rd (+1 config) single stacks 9mm pistols at that point.
I have the Alien Gear Cloak Tuck 3.0 IWB holster and I love it! I bought the one for a compact pistol, but it works fine with my current CCW setup -- compact slide and subcompact grip. I have other more expensive leather IWB holsters, but the Alien Gear is much more comfortable right out of the box. The leather ones are really nice, but it does take a while to break them in.
Thanks Scooter22 for confirming the 3.0 for the Compact fits with the Subcompact grip. A.G. was on the ball today (Sunday) and answered my email. I'll be placing my order when I'm done with this reply.
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Old 03-20-2017, 06:13 AM   #15
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This may have already been mentioned above, if so & I missed it I apologize.

*As for changing from the compact to subcompact grips the only drawback imo is the difference in the shape of the trigger guard on the sc models, due to the retention on some holsters (kydex and injection molded plastic ones) being primarily on the trigger guard then swapping grip frames and using your favorite holster for cc on both might not work out, just something else to consider.

This is one of the factors of why I modded a compact grip to subcompact length.
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