Icarus Precision ACE 365 311 FUSE IWB Holster

Icarus Precision ACE 365 311 FUSE Grip Module IWB Holster

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.

Grip Module Compatibility (Start Here)

This holster is specifically designed for use with the Icarus Precision ACE 365 311 Grip Module. Proper fit and retention depend on this exact configuration.

Icarus Precision ACE 365 311 FUSE Grip Module

• Only compatible with Icarus A.C.E. 365 311 FUSE grip module
• Not compatible with other Icarus A.C.E. 365 311 grip modules
• Not compatible with Icarus A.C.E. 365 "X" MACRO, Fuse or EVO grip modules.
• Not compatible with AXG or SXG grip modules
• Not compatible with Icarus Air Polymer grip modules

This precision-fit Inside-the-Waistband (IWB) holster is engineered specifically for the Icarus Precision ACE 365 311 FUSE paired with the P365-FUSE factory slide. It delivers a secure fit, smooth draw, and discreet everyday concealment.

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 the compatible grip module at Icarus Precision ACE 365 311 FUSE product page.

Fit & Compatibility

• Compatible with SIG manual safety models.
• Designed for all right-hand and left-hand Thumb Ledge Style variants of the Icarus ACE 365 311 grip module.
• Not compatible with other Icarus metal or Air Polymer grip modules.

Product Highlights

• Precision fit – Vacuum-formed on a CNC-machined mold from a CAD model of the firearm for consistent retention.
• Handedness – Available in right- and left-handed configurations
• Red-dot ready – Optic cut to clear popular slide-mounted red dots.
• Suppressor-sight compatible – Accommodates sights up to 0.400" (10 mm) in height.
• Adjustable retention – Fine-tune draw tension to your preference.
• Adjustable cant & ride height – Dial in carry angle and holster depth.
• ModWing option – Reduces printing and boosts concealment; includes two insert options.
• Full sweat guard – Improves comfort and protects the firearm.
• Open muzzle design – Compatible with threaded barrels and compensators.
• Smooth, rounded edges – All-day comfort with minimal hot spots.
• Phlster Enigma compatible – 100% compatible with the Phlster OS Enigma mounting pattern.
• Made in the USA – Proudly built in Logansport, Indiana.

Setup & Maintenance

After adjusting retention, cant, and ride height, apply a removable thread locker to each screw to help prevent hardware loss during daily carry.

Complete Your Carry Setup

Complete your concealed carry setup with purpose-built accessories designed for comfort, concealment, and everyday use.

4Bros Holster Wedge — Designed to improve concealment and comfort by helping angle the firearm grip closer to the body while reducing pressure points during IWB carry.

Magazine Carriers

• P365-FUSE IWB magazine pouch
• P365-FUSE OWB magazine pouch

Helpful Resources

• Inside-the-Waistband belt and no-belt attachment options explained
• We have a kit available should you need to remove the modwing that includes  (2) 3/8" Screws, (2) 1/4" Rubber Spacers, and (2) 1/4" Threaded Posts which can be purchased HERE.
• Icarus Precision holster collection
• Holster color and pattern guide

Frequently Asked Questions

Will this fit the Icarus metal grip module?

No. This model is built for the Icarus Precision ACE 365 311 FUSE and is not compatible with other Icarus metal or Air Polymer grip modules.

Is it compatible with the Phlster OS Enigma?

Yes. It mounts using standard IWB hole spacing and is fully compatible with the Phlster OS Enigma platform.

Is this holster available for left-handed shooters?

Yes. This holster is available in both right- and left-handed configurations. Select your preferred configuration when ordering.

Which red-dot optics will clear?

The holster is cut to clear most popular micro red dots used on the P365 footprint, such as the Holosun 507K and SIG RomeoZero, among similar optics.

What if I don’t see my exact configuration?

Contact our team and we’ll help you confirm the best fit for your setup.

• Full Sweat Guard
• Adjustable Retention
• Adjustable Cant
• Profile cut to allow red dot sights
• Open Muzzle for threaded barrels and compensators
• Minimal material and smooth edges
• Made from .093" thermoplastic for durability.
• Optional Modwing includes 2 inserts to allow the user to adjust the amount of leverage placed against the inside of the belt to reduce firearm printing
• Proudly Made in the USA

• Monoblock
• 1 Series Gear Clips
• Ultituck
• Soft Loops 
• RCS Overhooks
• Ulticlip

IWB Belt Attachments Explained

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