Adjustable retention Vacu-Formed Sig Sauer IWB Holster Shells

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The Next Generation of holster manufacturing is here! Available for the Sig 320 full size or compact 320 models (sub compact not available).

Save time and money with the new DIY "Vacu-Form" Adjustable Retention Series Holster Shells. Available for the most popular Smith & Wesson ® pistols in an IWB configuration.

  • In stock now
  • Black Boltaron
  • Holes sized to fit a wide variety of mounting options (Quick Clips, FOMI's, Tough Clips, PHLster Tuckstruts, ModWings, Raven Eidolon Claws and Struts and much more
  • Looking for OEM shells of your own? Talk to us about Vacu-Form shells to YOUR specifications!

Our goal is to make it easier to find the perfect holster when you Do It Yourself!


DISCLAIMER: “Sig”  and "Sig Sauer"is a federally registered trademark of Sig Sauer, Inc. and is one of many trademarks owned by Sig Sauer, Inc.  Neither DIY Holsters nor this site are affiliated in any manner with, or otherwise endorsed by, Sig Sauer.  The use of “Sig” or "Sig Sauer"  on this page is merely to advertise the sale of Sig Sauer pistols, parts, or components.  For genuine Sig Sauer products and parts visit



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  • 5
    Always 5 stars

    Posted by carlo delarosa on 29th May 2019

    Diy holster always brings out the best products. With the p365 holster, it is snug fit with the retention adjustment and is easy to conceal. Cant go wrong with these people.

  • 5
    Perfect fit for my Sig P320C

    Posted by Craig Jordan on 16th Jul 2018

    I'm working on a project on my EDC and didn't want to spend a lot if my idea didn't work. I was hoping to have a shell that would fit "close enough" and this fit perfect. I heated it up the folding area with a heat gun and wrapped it around my empty P320C and it folded correctly and the sites cleared with no issue.

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