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Sig P320 Full Size 40cal ShapeShift 4.0 IWB Holster

$55.88

ShapeShift Sig P320 .40 IWB Holster by Alien Gear Holsters



Anything less than a comfortable carry will mean you'll stop carrying. Anything less than a secure carry will mean you'll stop doing it. The ShapeShift Sig P320 .40 IWB Holster will keep you carrying day after day, year over year. This holster is the culmination in decades of holster design.

This is the Sig P320 .40 concealed carry holster perfected.

The 4.0 IWB mounts the ShapeShift shell to a plush backing platform. You get the comfortable carry that you need in order to carry all day, but you also get the fitment and features necessary for a secure carry. Customization is also a design priority, as this holster can be dialed in to suit you.

The ShapeShift shell is custom-molded for the Sig P320 and M17 in .40 S&W, so much so that it will not fit the 9mm version. The trigger guard is fully wrapped for greater security. This gives you the custom fitment necessary for a secure carry, and a sure draw from your Sig P320 .40 hybrid holster.

Passive retention is fully adjustable, by using the included twist lock nut instead of having to use tools.

The backing platform has a back layer of CoolVent neoprene, a cushioning layer that wicks away moisture and breathes against the skin. The core of the holster base is reinforcing layers of spring steel and woven ballistic nylon, giving the holster a firm spine, increasing support for the gun and ensuring a long service life.

Your choice of belt clip is included with your IWB holster for Sig P320 .40 pistols, or you can purchase several different types to give yourself options. Ride height and cant angle are adjustable by moving the belt clips, which can be done without needing the use of tools as well.

This Sig P320 .40 IWB holster is made in the USA and comes backed by Alien Gear Holsters' Iron-Clad Guarantee. We back the holster for life with our Forever Warranty. We also give you the first 30 days of ownership - a 30 Day Test Drive - to wear the holster and determine if its the holster for you. Return for a full refund if not.

This is how you shift into a more comfortable carry.


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Customer Reviews

4.9 / 5 (Based on 127 Reviews)


Displaying reviews 1-10 (of 127)

probably the best IWB holster I have ever had Review by Joe
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probably the best IWB holster I have ever had. Easy to use, good retention and comfortable. I have been using it for over a year and it has held up great. I would like to have had mental clips, but other then that , it's perfect for my needs.
(Posted on 10/3/2019)
Awsome Holster Review by Stan
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I purchased your Glock 36 Cloak Tuck 3.5 IWB. Made adjustments on thee Retention and Cant in about 10 minutes. This is the best Inside carry Holster I've ever owned. comfortable!!!! and easy draw. Sometimes I don't even no I've got it on. Already showed family and friends and some of them will be ordering soon. Great Thanks S.J. (Posted on 8/23/2019)
Excellent Review by sdharvey
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I got this holster about a month ago now and I have worn it every single day so far. I have not had any problems or discomforts out of the holster itself. I have come to find that any discomfort I do have though is from the size of the gun itself. I highly recommend getting this holster, My favorite thing about it is the retention. I never have to worry about it accidentally falling out. I also love that its tuck-able since I wear dress clothes almost every day. I did a lot of research prior to picking this and I am so glad that I did. I will be buying more shells for my other pistols as well.. (Posted on 8/7/2019)
Florida tested Florida Approved Review by Tactical Waffle
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I am relatively new to conceal carrying and love my full size sig P-320, but I live in Florida and thought that even with this holster I would be incapable of carrying it unless it was winter or as close to winter as Florida gets and under at least a hoodie or large coat. I was astonished to be so wrong. I have carried this in the Florida hot humid summer sweating my ass off and yet the sig stays dry the holster gets a little damp but dries quickly and is always super comfortable. I conceal at the 3:00 position with a foreword cant and I can bend over, sit down and drive with my beast of a gun concealed as ever. I decided to actually really push my limits with this holster and helped a close friend move today. Even with my firearm and holster I was still able to comfortable move boxes get in and out of truck beds (sometimes by jumping), move couches and was still comfortable and concealed without an undershirt and wearing nothing other than a pair of cargo shorts and a black sleeveless shirt. Alien Gear FTW
PS: I took a nap wearing it by accident it was a comfy nap 10/10 (Posted on 7/31/2019)
Great for every day use Review by Robert L
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I have worn this holster every day for a couple of years now. Still looks almost new after 365 day use. Very comfortable, you almost forget you're wearing it. Worth every penny. Wears well no matter what season. Doesn't print and no one knows it's there. Comfortable standing or sitting with great retention of firearm. (Posted on 7/12/2019)
A must have Review by Mike
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Bought my shapeshift 4.0 after a police officer highly recommended alien gear. I have been through a lot of different holsters for my full size .40 cal and I'm pretty demanding and alien gear by far is the best of the best I've ever had and used. Very versatile with its options and adjustability not to mention I forget I'm wearing it at times . I'm going to expand on my 4.0 system . I love it's made to fit my gun and the fact I can actually get it in left handed. No regrets. A must have for anyone (Posted on 7/2/2019)
Good quality and design BUT adds 4" to waist Review by Fatso
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This is honestly a really nice holster. The materials and design are great. I like that everything is modular and can switch things out and customize it. HAVING SAID THAT... This holster is basically useless to me. I wear a size 32 waist and have gained a little weight in the last year or so. I cant wear this holster with any of my current pants. So this isnt really a problem with the holsters design or construction but with me being a fatty. Just know that if you get this holster you will need to size up 4-6" inches on your waist for it to work. I had to get a size 38 to make it work. I dont feel like buying a whole new wardrobe so Ill probably try something a little smaller. Id honestly return it as its useless to me now but I dont have the box anymore and with shipping etc it doesnt seem worth it. Thats one of the risks I guess. (Posted on 6/29/2019)
Great holsters Review by MIke
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I bought my first one for my Glock 29. I have a medium frame at 5' 6" and I was amazed at how comfortable this holster is with that wide gun. I wore it everywhere for a week and barely noticed it. Make your adjustments and the weapon stays put! I bought one for my Glock 26 and plan to buy another for my Glock 43. Absolutely GREAT holsters. BTW, I rarely write reviews on anything...this one was very easy! (Posted on 6/12/2019)
Extremely comfortable Review by Dan R.
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This thing is great. Never thought I'd be able carry a full size 1911 so comfortably. And for only around $55. That's pretty mind blowing. A plain Kydex holster costs more than that. The combination of functionality, customization and value is unmatched, in my opinion. Highly recommended. (Posted on 6/11/2019)
Excellent holster Review by Nathan
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Hands down the best iwb holster on the market with customer service to match. If you want your firearm comfortably and securely concealed look no further. (Posted on 5/19/2019)

Displaying reviews 1-10 (of 127) | Back to top

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