Quality product! Outstanding customer service just received Mine 2 days ago would highly recommend
I carry at 3 o'clock and it doesnt work well at that position. However, for appendix carry it does give better concealment.
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FOUR BROTHERS HOLSTERS
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Note: Icarus Precision supporting holsters are not returnable for anything other than quality or workmanship issues. They are specialty items for Icarus Precision Grip Modules used with factory slides, which impact fit and function of the holster. We do not guarantee fitment with aftermarket slides or other components.
This holster is specifically designed for use with the Icarus Precision A.C.E. “X” MACRO, FUSE MACRO or FUSE EVO grip module. Proper fit and retention depend on this exact configuration.
Explore available grip module options from Icarus Precision:
Icarus Precision A.C.E. 365 “X” MACRO
Icarus Precision A.C.E. 365 "FUSE" EVO
Icarus Precision A.C.E.. 365 "FUSE" MACRO
Every holster is vacuum-formed on precision-machined molds developed from CAD models of the actual firearm. After forming, each unit is trimmed, finished, and inspected in-house to ensure a clean fit and smooth, consistent draw.
We conduct final fitment and retention testing on the real firearm to guarantee proper lockup and stability. Retention is fully user-adjustable to match your preferred level of draw resistance.
This OWB duty and competition holster is engineered for the Sig Sauer P365-FUSE slide assemblies when paired with the Icarus Precision A.C.E. 365 “X” MACRO, A.C.E.365 "FUSE" MACRO, and A.C.E. "FUSE" EVO Grip Modules. Designed for fast draws, secure retention, and dependable alignment, it excels in training, duty use, and competition environments.
Not compatible with P365 AXG or SXG grip modules, Norsso slides, or the Icarus Air Polymer grip modules. Supports compatible manual safety configurations.
This holster is designed to work with the factory slide. Any aftermarket slide design variations from the OEM slide dimensions will affect the holster fit and retention.
Learn more about selecting the right holster and attachments in our competition-focused guide:
Be Ready When the Competition Starts
Browse all compatible holsters in our
Icarus Precision Holster Collection.
Need assistance choosing a holster color? View our
Holster Color Guide.
*We recommend applying a removable thread locker to all screws upon receipt to prevent hardware loss during heavy use.
No. AXG and SXG grip modules are not compatible with this design.
Yes. It is compatible with manual safety configurations for all supported P365 models.
No. It is designed specifically for aluminum A.C.E. and A.C.E. EVO modules.
No. Norsso slide profiles are not supported.
Yes. The adjustable ride height, cant options, and fast-draw geometry make it ideal for competitive shooting sports.
Yes. This holster is available in both right- and left-handed configurations. Select your preferred configuration when ordering.
Yes. The duty/competition cut clears most common red dot optics mounted on the P365 series.
Yes. The open-muzzle design ensures compatibility with extended barrels and compensators.
• Outside Waistband Holster specifically designed for USPSA, 3-Gun, Steel Challenge, and other competition shooting sports (May not be IDPA Legal)
• Holster purchase includes one belt attachment, based on your selected option
• Holster Retention is easily adjustable
• Molded with .093" thick thermoplastic for durability
• 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.
Please review our Four Brothers Holsters Exchange, Return and Refund Policy
Please review our Four Brothers Holsters Terms of Service

Sturdy and fits perfect on my 3.7 slide with Radian Ramjet comp on fuse frame.
This holster is awesome! Not many options for Icarus precision customizable side cars out there, had never heard of this company prior! Man am I impressed by the overall quality of this holster! Far more adjustable than anything else I’ve tried in this style(Tier1, Trex, LAS). I’m still adjusting to exactly how I like it about 2 weeks in. Only complaint I found is my optic (Swampfox Sentinel 2) did not fit and I did have to remove material around the optic to make it compatible. I know this isn’t a common optic so I wasn’t worried about it at all! Highly recommend you go buy this one
Quality product! Outstanding customer service just received Mine 2 days ago would highly recommend
I carry at 3 o'clock and it doesnt work well at that position. However, for appendix carry it does give better concealment.
Its incredibly comfortable