The Enigma OS – Standard is the Enigma platform for people who want beltless carry with a compatible holster of their choice. “OS” stands for Open Source—meaning, you provide the compatible holster.
If you only read one thing
Enigma OS – Standard does not include a holster. You choose a compatible holster for your firearm. This is the right choice when your gun isn't on the Enigma Express compatibility list, or when you prefer a specific holster brand or model.
Check your firearm compatibility
Our Selector Tool will guide you to the right Enigma model for your gun and accessory combination.
Check Compatibility →
You choose the holster
No holster included. You select and purchase a compatible holster separately, matched to your firearm.
Beltless carry
The system provides its own structure. Your pants belt is not required, which means you wear whatever you want.
OS-Standard compatibility
Works with compatible holsters from PHLster and other manufacturers—not limited to the Express gun list.
Who is Enigma OS – Standard for?
• People whose firearm is not on the Enigma Express compatibility list
• People who want to use a specific holster brand or model they prefer
• Anyone who wants the Enigma platform paired with a compatible holster of their choice
• Users comfortable with assembly and holster selection using the Fit Guide
How Enigma OS – Standard works
Most holsters clip to your belt, which means you can only place the gun where your pants rise allows. The Enigma changes that—it’s worn directly on your body, separate from your clothing.
What’s different
Your pants are no longer the foundation. The system is worn directly on your body.
What stays the same
A secure holster provides retention and trigger protection.
Why it matters
This innovative design allows the user to fine tune their comfort, concealment, access and even clothing style.
What “Open Source” means
The OS model is designed to accept compatible holsters from PHLster and other manufacturers. You're not locked into one holster—you choose the one that fits your firearm and meets the compatibility requirements. The Fit Guide helps you find what works.
What this enables
- Carry without a belt on your pants
- Consistent placement across different clothing styles
- Position the system where it conceals best on your body
Is it like a bellyband?
No. A bellyband is a fabric wrap that relies on compression and friction. The Enigma is a chassis system with a secure Kydex holster—you get firm retention, consistent placement, and a stable draw without relying on elastic or compression.
What's included with Enigma OS – Standard
Enigma OS – Standard includes the belt, chassis, two leg leash options, and hardware. A holster is not included—you will source a compatible holster separately.
Holster not included—this is by design
The OS model gives you flexibility to pair the Enigma platform with a compatible holster of your choosing. Use the Fit Guide to find a compatible holster before purchasing the Enigma OS.
Faceplate / Chassis
The heart of the Enigma system. Variable stiffness and anti-slip texture for the best performance.
System Belt
Anchors the system on your body. Adjustable up to 46" waist (or up to 64" with the optional Sport Belt accessory).
Leg Leash
Helps keep the holster from riding up during the draw. Adjustable for thighs up to 36". Two leash options included.
Fidlock Magnetic Buckle
Quick on/off with one-hand operation. Optional Reduced Size Buckle is available.
Mounting Hardware
All screws and hardware needed to mount a compatible holster to the faceplate. Assembly is required.
Everything included with the Enigma OS – Standard (holster not included)
What you need to provide
A compatible IWB holster for your firearm. The holster must have one of three compatible concealment wings (ModWing, Dark Wing, or RCS VG2) with the correct mounting hole spacing and grip clearance. Use the Fit Guide to confirm compatibility before purchasing.
Sizing at a glance
Waist Belt
Up to 46" (64" with Sport Belt)
Leg Leash
Up to 36" thigh
Optics
Red dot compatible
Is Enigma OS – Standard right for your setup?
Enigma OS – Standard is for handguns without a weapon-mounted light or attached laser. Unlike Express models, compatibility depends on finding a holster that fits your firearm and the Enigma platform.
The holster is the “make or break” piece
Not every holster will work with the Enigma OS platform. Your holster must mount through a compatible concealment wing with the correct hole spacing and grip clearance. The Fit Guide walks you through how to confirm this before you purchase.
Compatible shells have two mounting holes directly under the trigger guard
Check for enough clearance between the top of the wing and the grip
Three compatible wing types: ModWing, Dark Wing, and RCS VG2 — hole spacing must be ⅝" (0.625") center to center. See full Fit Guide →
Use OS – Standard when:
- Your firearm is not on the Enigma Express compatibility list
- You want to use a specific holster brand or model you prefer
- You do not have a weapon-mounted light or attached laser on the firearm
Consider Enigma Express instead when:
- Your firearm is on the Express compatibility list
- You want a pre-assembled, ready-to-wear solution
- You prefer the simplest starting point
Recommended holster brands
These brands offer holsters designed to work with the Enigma OS - Standard. The Fit Guide has full details, direct links, and ordering notes for each.
PHLster — Skeleton (minimalist, no added muzzle length) and Pro (extra muzzle length with molded wedge)
Henry Holsters — Flint (full size) and Flint Compact. Also offers pre-assembled Enigma + holster packages
JM Custom Kydex — Quick Ship and Custom Enigma Shells (wide variety of gun fits)
Haven Defense Co — Budget-friendly Enigma Ready Shells
KSG Holsters — Declaration (choose “none, Enigma compatible” belt attachment and “Modwing” claw)
Dark Star Gear — Hitchhiker and Orion (adjustable retention; may need Fixed Retention Kit)
Concealment Express / Rounded Gear — Budget option (must add “Claw Kit” option; adjustable retention)
PHLster is not affiliated with other manufacturers. Check the full Fit Guide for links and current availability.
Holster compatibility requirements (summary)
- Two mounting holes directly below the trigger guard, spaced exactly ⅝" (0.625") center to center
- Must use a ModWing, Dark Wing, or RCS VG2 concealment wing
- Enough clearance between the top of the wing and the grip to get your hand on the gun
- Holster must fully enclose the slide (no open-top or trigger-guard-only holsters)
- No sidecar holsters (attached magazine carriers)
- No hybrid holsters (holsters with a leather or fabric backer)
- No light-bearing holsters—the Standard faceplate is not compatible with light-bearing shells
Do not modify your holster or faceplate
Do not drill, cut, heat-form, or modify your holster shell or the Enigma faceplate to “make it fit.” This voids the warranty, weakens the materials, and can lead to a dangerous failure. If your holster is not compatible, get one that is. See Enigma Safety Information →
Have a weapon-mounted light or attached laser?
You need Enigma OS – Light Bearing instead. The Standard and Light Bearing models are not interchangeable. Do not mount a light-bearing holster to the Standard faceplate. Learn why →
Red dot optic? You're in the right place.
A red dot optic is not the same thing as a weapon-mounted light. Optics do not require a light-bearing holster or Enigma. If your pistol has a red dot but no weapon-mounted light or laser, Enigma OS – Standard is the correct model.
Confirm your holster before you buy
The full Fit Guide has direct links to every recommended brand, detailed compatibility requirements, and answers to common questions. Do not guess—follow the guide and confirm compatibility first.
Open the Full Fit Guide →What to expect when it arrives
Enigma OS – Standard requires assembly. You'll mount your compatible holster to the faceplate, route the belt, and adjust everything to fit your body. This is more involved than the Express models, but the instructions walk you through it step by step.
Assembly required
Unlike Express models, the OS does not come pre-assembled. You'll mount the holster to the faceplate through the concealment wing and follow the assembly instructions.
Expect a dial-in period
After assembly, you'll still need to adjust belt tension, leg leash length, and holster positioning. Plan to spend time over your first few wears finding what works and consider joining us for our next Live Enigma Tune Up Class.
Before you start: have your holster ready
You need a compatible holster in hand before you begin assembly. Make sure it has one of the three compatible concealment wings, the correct hole spacing, and sufficient grip clearance. Use the Fit Guide to confirm before purchasing.
Your first steps
- Read the safety information — This is critical. Do this first.
- Confirm your holster compatibility — Use the Fit Guide. Don't skip this step.
- Follow the assembly instructions — Written (left-hand and right-hand) and video instructions are both available.
- Adjust the leg leash — Shouldn’t be tighter than a pair of briefs.
- Test: stand, sit, walk — Record yourself performing normal movements to test your concealment.
Fixed vs. adjustable retention
Holsters with fixed retention are easier to mount to the Enigma faceplate. If your holster has adjustable retention, you may need a Fixed Retention Kit to install it safely. The Fit Guide notes which brands require this.
Common mistake
Trying to use a holster that doesn't meet the compatibility requirements—wrong wing type, wrong hole spacing, or a light-bearing holster on the Standard faceplate. Start with the Fit Guide and follow it completely.
Concealment basics
Good concealment is a skill—not just a gear purchase. The Enigma gives you the tools, but understanding a few core principles will help you get there faster with less trial and error.
It starts between your ears
Don't rush to buy more gear. Concealment Principles are universal—they apply to every body type and every gun size. Learn them first, and you'll solve problems faster.
Find your sweet spot
Your body has natural "valleys" where the gun can tuck in rather than stick out. With a larger setup, finding this sweet spot matters even more.
Grip rotation & tuck
The grip (handle) of your gun is usually what prints. Getting it to rotate toward your body and tuck in is the key to invisible concealment.
The Poke and Check
A simple diagnostic: poke the grip through your shirt. If it moves easily, you need more rotation or tuck. This tells you exactly what to adjust.
Wedges: a powerful tool
Adding a wedge to your holster can improve both comfort and concealment. Wedges push the muzzle end out, which tucks the grip in. Learn more about wedges →
The Keel Principle
A longer holster can actually be more comfortable and concealable than a shorter one. Extra muzzle length acts like a keel, keeping the gun from tipping outward. This is why some recommended holsters come with added muzzle length. Learn about the Keel Principle →
Quick clothing tip
Fabric that hangs smoothly conceals better than fabric that clings tightly. Patterns and texture also help break up any subtle outlines. Note that dri-fit like materials will enhance printing issues.
Support & resources
PHLster is built on education. We want you to succeed with your Enigma—not just buy it. Here’s where to get help:
📖 Full Instructions
Quick Start guide, leg leash setup, adjustments, accessories, troubleshooting—everything in one place.
🤖 Ask Phil
24/7 AI assistant for quick questions about compatibility, setup, and finding the right resources.
🎥 YouTube Channel
Video library covering setup, concealment mechanics, adjustments, and real-world carry education.
👥 Community Group
Join the PHLster Concealment Workshop on Facebook—35,000+ members sharing tips, wins, and troubleshooting.
💬 Contact Support
Need to talk to a person? Our support team can help with orders, compatibility questions, and troubleshooting.
⚠️ Safety Information
Critical safety information for Enigma users. Read this before you start carrying.
30-day returns
We accept returns within 30 days of delivery. That said, most comfort and concealment issues are solved with a little adjustment and guidance—reach out before giving up. We're here to help you succeed.