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FOUR BROTHERS HOLSTERS
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Designed specifically for the SIG Sauer P320-XTEN 10MM equipped with a compatible Streamlight TLR-1 series weapon light, this Outside Waistband (OWB) Holster provides a secure, light-specific fit for everyday carry, range sessions, and training.
Constructed from durable .093" thermoplastic, each holster combines adjustable light-based retention, an optics-ready profile, and versatile mounting options for consistent performance.
Compatible Firearm:
IMPORTANT: This holster does NOT fit the SIG Sauer P320-XTEN-COMP.
Compatible Streamlight Weapon Lights:
NOT Compatible with TLR-1 HL-X or HP-X
Important Fitment Requirement: This holster is designed around the P320 key rail insert used with compatible Streamlight TLR-1, TLR-1 HL, and TLR-1 HP lights.
Some variations in the light body between older and newer TLR-1 models can affect fit and retention. Our adjustable retention system is designed to accommodate these manufacturing tolerances across compatible generations.
Light-Based Retention: This holster retains the firearm through the mounted weapon light rather than the pistol frame. The compatible light must remain installed for proper fit and retention.
A dependable holster starts with the right fit. Each 4BROS holster is shaped using a precision-machined mold developed from a CAD model of the actual firearm, allowing for consistent dimensions, proper clearance, and secure retention around the designated firearm and light combination.
From vacuum-forming to final assembly, every holster is formed, trimmed, and hand-finished in-house. Each unit is then individually tested with the actual pistol and mounted light to verify fit, retention, and smooth draw performance.
Adjustable retention hardware allows you to fine-tune draw resistance while accommodating minor dimensional differences between compatible TLR-1 light models.
Optics Compatibility Note: The listed optics have been accounted for in this holster design. Other red dot sights have not been tested and may interfere with the holster. Please contact us to verify clearance before ordering.
Configure your OWB holster with one of our 4BROS Belt Slides or other attachment options, including the Blade-Tech Tek-Lok and Safariland QLS Fork, to suit your preferred setup.
Learn more about our OWB belt attachment options to find the carry configuration that works best for you.
Please note: Our 4BROS Belt Slides are designed to work with standard belts for everyday carry, not thicker "Battle Belt" style belts with rows of MOLLE on the outside.
Start with a dependable belt.
Keep an extra magazine within reach.
Explore additional P320-XTEN configurations.
Make it your own.
After adjusting your holster to your preferred setup, we recommend applying a removable thread locker to all mounting screws to help prevent hardware from loosening during regular use.
Watch our Apply Thread Locker to Your Holster video for a quick application guide.
No. This holster is NOT compatible with the P320-XTEN-COMP. It is designed specifically for the standard SIG Sauer P320-XTEN 10MM.
This holster is designed for the Streamlight TLR-1, TLR-1 HL, and TLR-1 HP. It does not fit the TLR-1 HL-X or TLR-1 HP-X.
No. Retention is based on the mounted weapon light rather than the firearm frame. The compatible light must remain installed for proper fit and retention.
This holster is designed around the P320 key rail insert used with compatible TLR-1, TLR-1 HL, and TLR-1 HP lights.
Yes. The adjustable retention system is designed to accommodate manufacturing variations between older and newer compatible TLR-1, TLR-1 HL, and TLR-1 HP lights.
The holster profile is designed to accommodate the Trijicon SRO, Holosun 508, Holosun 509, and SIG Sauer Romeo1. Other optics have not been tested and may interfere with the holster.
Yes. Adjustable retention hardware allows you to customize draw resistance.
Available configurations include the 4BROS Belt Slide, Blade-Tech Tek-Lok, and Safariland QLS Fork.
Our 4BROS Belt Slides are designed for standard belts and are not compatible with thicker MOLLE-style battle belts. Other attachment options may be better suited to those setups.
Every 4BROS holster is precision-formed and hand-finished in the USA using durable .093" thermoplastic.
Yes. Right- and left-handed configurations are available.
Contact 4BROS for assistance confirming compatibility before ordering.
• Full Sweat Guard
• Adjustable Retention
• Profile cut to allow red dot sights
• Open Muzzle for threaded barrels and compensators
• Minimal material and smooth edges
• Proudly Made in the USA
Made in America. Founded, located, engineered, manufactured, and shipped from Northern Indiana.
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Excellent product. Shipped super fast.
For me the best out there
Fits fantastic!
I have bought a handful of holsters from you all and have been satisfied but this one did not fit for shit even with the retention loosened all the way you have to draw away from your body even pulling straight up it will not release and then on the top of the slide both sides of the sight it was dragging so bad it was scratching my slide after a lot of sanding on the inside of the holster where the slide was dragging and lots of lube I think it's not scratching no more but I have oil dripping off my slide this holster was bought for my back pack for back country hunts and with the release issue it will probably sit in my closet. (Very disappointed)
great holster. it is very tight, but holds the pistol very well
This was exactly what I needed and it fits perfectly! Thank you guys! Now I’m looking at the chest rig for it!
Fits nicely
It's ok. When you take off the light it doesn't fit secure. It made cheaper than my other one the is appendix
I love this holster! More importantly, I realized two days after ordering that I forgot to include the light option. I reached out to customer service, and they got back to me right away to help fix the order.
Thank you for the great service!
Product is great, fit is perfect!
great holster. good retention and adjustability
