4BROS Icarus Precision P365 RaceCar Appendix Rig

• Icarus Precision ACE P365 311 XL/Macro & TLR-7 HL-X

4BROS Icarus Precision P365 RaceCar Appendix Rig – IWB Sidecar Holster for Icarus Precision P365 Grip Modules

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.

Designed for comfort, built for concealment. The 4BROS Icarus Precision P365 RaceCar Appendix Rig is a premium Inside Waistband (IWB) sidecar holster system engineered specifically for Sig Sauer P365 pistols equipped with Icarus Precision grip modules. Featuring adjustable sidecar spacing, a flexible injection-molded adapter system, and customizable ride height and cant adjustments, the RaceCar Appendix Rig is designed to improve comfort, reduce printing, and provide a more natural fit for everyday concealed carry.

This appendix carry holster supports both pistol-only and light-bearing configurations while delivering secure retention, adjustability, and all-day comfort for concealed carry with Icarus Precision-equipped Sig Sauer P365 series pistols.

Compatible lights available from Four Brothers:

Streamlight TLR-7 HL-X Sub USB, Part# 69505 which can be purchased from us HERE.

Streamlight TLR-7 X USB, Part # 69455 which can be purchased from us HERE

Streamlight TLR-7 HL-X USB, part # 69458, which can be purchased from us HERE

Designed for Comfortable Appendix Carry

The 4BROS RaceCar Injection-Molded Appendix Adapter Plate is engineered to flex and articulate with the body's natural contours and movement. This flexibility helps reduce common pressure points associated with appendix carry while allowing the holster to conform more naturally against the body for enhanced concealment and long-term comfort.

Quick Overview

• Flexible 4BROS RaceCar Injection-Molded Appendix Adapter Plate
• Adjustable spacing between holster and magazine carrier
• Adjustable cant and ride height for both holster and mag carrier
• Designed to improve comfort during seated carry and daily movement
• Compatible with red dot optics and suppressor-height sights
• Retention indexed on supported weapon-mounted lights
• Made in the USA

Equipped with Discreet Carry Concepts 1 Series Overhooks and a Modwing concealment wing, the RaceCar Appendix Rig is designed to provide a secure connection to the belt while helping rotate the pistol grip closer to the body for improved concealment and reduced printing.

Information on the belt attachments used for the 4BROS RaceCar Appendix Rigs can be found through our Inside Waistband Attachments Blog article.

Unlike traditional fixed sidecar holsters that can feel rigid during daily carry, the RaceCar Appendix Rig utilizes a flexible 4BROS RaceCar Injection-Molded Appendix Adapter Plate that connects the holster and magazine carrier. This articulated design allows the system to flex naturally with the body while helping improve comfort, concealment, and mobility throughout daily movement, seated carry, and extended wear.

Supported Icarus Precision Grip Module Configurations

Icarus Precision A.C.E. Module P365/XL/Macro: Designed for the Icarus Precision ACE "X" MACRO or "XL" EVO grip module paired with factory Sig Sauer P365, P365XL, or P365-XMACRO slides.

• Icarus Precision A.C.E. 365 “X” MACRO Grip Module
• Icarus Precision A.C.E. 365 "XL" EVO Grip Module

Icarus Precision A.C.E. Module P365-FUSE: Engineered for the Sig Sauer P365-FUSE slide paired with the Icarus Precision A.C.E. “X” MACRO, FUSE MACRO, or FUSE EVO grip modules.

• Icarus Precision A.C.E. 365 “X” MACRO
• Icarus Precision A.C.E. 365 "FUSE" EVO
• Icarus Precision A.C.E. 365 "FUSE" MACRO

Sig Sauer P365-XMACRO & Icarus Precision A.C.E. Module & TLR-7 Sub: Precision-formed for the Sig Sauer P365-XMACRO or P365XL slide paired with the Icarus Precision A.C.E. 365 “X” MACRO Grip Module and the Streamlight TLR-7 Sub, TLR-7 X Sub, or TLR-7 HL-X Sub 1913 weapon light.

• Icarus Precision A.C.E. 365 “X” MACRO Grip Module

Sig Sauer P365-XMACRO & Icarus Precision A.C.E. Module & TLR-7 X/A: Designed for the Sig Sauer P365-XMACRO with the Icarus Precision A.C.E. 365 "X" MACRO Grip Module and the Streamlight TLR-7X or TLR-7A weapon-mounted light.

• Icarus Precision A.C.E. 365 “X” MACRO Grip Module

Sig Sauer P365-XMACRO & Icarus Precision A.C.E. Module & TLR-7 HL-X: Designed for the Sig Sauer P365-XMACRO with the Icarus Precision A.C.E. 365 “X” MACRO Grip Module and Streamlight TLR-7 HL-X, TLR-7A, or TLR-7X weapon lights using the 1913-3 key.

• Icarus Precision A.C.E. 365 “X” MACRO Grip Module

Sig Sauer P365XL & Icarus Precision A.C.E. Module & TLR-7 Sub: Precision-formed for Sig Sauer P365 series pistols using the Icarus Precision A.C.E. 365 "XL" EVO grip module paired with the Streamlight TLR-7 Sub 1913, TLR-7 X Sub 1913, or TLR-7 HL-X Sub 1913 weapon light.

• Icarus Precision A.C.E. 365 "XL" EVO Grip Module

Sig Sauer P365XL & Icarus Precision A.C.E. Module & TLR-7 X/A: Designed for Sig Sauer P365 series pistols equipped with the Icarus Precision A.C.E. 365 "XL" EVO grip module and the Streamlight TLR-7A or TLR-7X weapon light using the #3 key.

• Icarus Precision A.C.E. 365 "XL" EVO Grip Module

Sig Sauer P365XL & Icarus Precision A.C.E. Module & TLR-7 HL-X: Designed for the Sig Sauer P365, P365X, and P365XL paired with the Icarus Precision A.C.E. 365 "XL" EVO grip module and the Streamlight TLR-7 HL-X weapon light.

• Icarus Precision A.C.E. 365 "XL" EVO Grip Module

Icarus Precision AIR Polymer P365-XMACRO/XL: Precision-fit IWB holster designed for Sig Sauer P365-XMACRO and P365XL factory slides paired with the Icarus Precision AIR Polymer XMACRO Grip Module.

Icarus Precision AIR Polymer XMACRO Grip Module

Icarus Precision AIR Polymer P365-FUSE: Precision-fit IWB holster designed for Sig Sauer P365-XMACRO, P365XL, and P365-FUSE factory slides paired with the Icarus Precision AIR Polymer XMACRO Grip Module.

Icarus Precision AIR Polymer XMACRO Grip Module

Icarus Precision ACE P365 311 XL/Macro: Precision-fit IWB holster engineered specifically for the Icarus Precision ACE 365 311 paired with the P365-MACRO or P365XL factory slide.

Icarus Precision ACE 365 311 product page.

Icarus Precision ACE P365 311 FUSE: Precision-fit IWB holster engineered specifically for the Icarus Precision ACE 365 311 FUSE paired with the P365-FUSE factory slide.

Icarus Precision ACE 365 311 FUSE product page.

Key Features

• 4BROS RaceCar Injection-Molded Appendix Adapter Plate – Lightweight, durable, and engineered to provide flexibility without sacrificing support.
• Adjustable Sidecar Spacing – Customize the distance between the holster and magazine carrier for improved comfort and concealment.
• Below-the-Beltline Bridge Design – Designed to reduce rigidity across the beltline while allowing the system to flex naturally with the body.
• Adjustable Cant & Ride Height – Customize draw angle and carry position for both the holster and magazine carrier.
• Retention on the Light (Light-Bearing Models) – Light-bearing configurations retain on the weapon-mounted light for secure retention and repeatable indexing.
• Optics Ready Design – Compatible with most popular pistol-mounted red dot optics used on Sig Sauer P365 series pistols.
• Suppressor Height Sight Compatible – Compatible with most standard and suppressor-height iron sights.

Information on available holster color options is available in our Holster Colors Guide.

View additional compatible appendix carry options in the 4BROS RaceCar Appendix Rig Collection.

Made in the USA

The 4BROS Icarus Precision P365 RaceCar Appendix Rig is proudly manufactured in Logansport, Indiana using premium materials, precision CNC-cut components, and purpose-built forming processes.

Pro Tip: Apply a removable thread locker to all hardware screws after final adjustment to help prevent loosening over time.

Frequently Asked Questions

What is the 4BROS Icarus Precision P365 RaceCar Appendix Rig?

It is an IWB sidecar-style appendix holster designed specifically for Sig Sauer P365 series pistols equipped with Icarus Precision grip modules. The RaceCar design provides adjustable spacing, improved flexibility, and enhanced concealment comfort.

What grip modules does this holster support?

The holster supports multiple Icarus Precision grip modules including A.C.E. X MACRO, XL EVO, FUSE EVO, FUSE MACRO, AIR Polymer XMACRO, and ACE 365 311 variants listed in the fitment section above.

How does retention work?

Light-bearing holsters retain on the weapon-mounted light while non-light-bearing holsters retain on the pistol. Magazine retention is adjustable using the side-mounted tension screw.

Is the holster adjustable?

Yes. Both the holster and magazine carrier feature adjustable cant and ride height, while the RaceCar design also allows adjustable spacing between the components.

Will this holster work with red dot optics?

Yes. The holster profile is designed to clear most popular pistol-mounted red dot optics commonly used on Sig Sauer P365 series pistols.

What if my Icarus Precision or P365 configuration is not listed?

If your specific pistol, grip module, or weapon light configuration is not shown, contact the 4BROS holster support team. Additional configurations may already be supported or under evaluation.

Please review our Four Brothers Holsters Exchange, Return and Refund Policy

Made in America. Founded, located, engineered, manufactured, and shipped from Northern Indiana.