4BROS Glock RaceCar Appendix Rig

4BROS Glock RaceCar Appendix Rig – IWB Sidecar Holster for Glock Pistols Built for comfort, concealment, and adaptability. The 4BROS Glock RaceCar Appendix Rig is an IWB (Inside Waistband) appendix sidecar holster system designed specifically for Glock pistols. Featuring adjustable sidecar spacing, a flexible injection-molded adapter system, and customizable ride height and cant adjustments, the RaceCar Appendix Rig is engineered to improve comfort, reduce printing, and provide a more natural fit for everyday concealed carry. 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. Key Features 4BROS RaceCar Injection-Molded Appendix Adapter Plate – Lightweight, durable, and engineered to provide flexibility without sacrificing support. The adapter plate twists and articulates with the natural angles and curves of the body to improve comfort and concealment during appendix carry. Adjustable Sidecar Spacing – Customize the distance between the holster and magazine carrier to optimize concealment, comfort, and carry positioning for different body types and carry preferences. Adjustable Cant & Ride Height – Fine-tune the draw angle and carry height of the holster to improve concealment, reduce firearm printing, and establish a consistent draw stroke. Adjustable Magazine Carrier Height & Cant – Customize the magazine carrier's ride height and angle to improve accessibility, comfort, and concealment. Optimized for Daily Carry – Designed to reduce hot spots and pressure points commonly associated with appendix carry while maintaining stability during movement, seated carry, and extended wear. Below-the-Beltline Bridge Design – The connection point between the holster and magazine carrier is positioned below the beltline to improve concealment, reduce rigidity across the beltline, and allow the system to flex more naturally with the body during movement and seated carry. Retention on the Light (Light-Bearing Models) – Compatible weapon-mounted light configurations provide secure retention, repeatable indexing, and consistent draw performance. Precision Molded Fitment – Each holster is custom-formed to the exact firearm and weapon light combination selected to ensure proper retention, clearance, and reliability. Optics Ready Design – Compatible with most popular pistol-mounted red dot optics commonly used on Glock pistols. Suppressor Height Sight Compatible – Compatible with most standard and suppressor-height iron sights used on modern defensive pistols. 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. Precision Fitment for Glock Pistols Pistol Fitment: Each holster is precision-formed to the exact Glock pistol or pistol/light combination selected from the dropdown menu to ensure proper fit and retention. Magazine Carrier: The included magazine carrier is matched to your selected firearm platform and features adjustable retention through a side-mounted tension screw. Optics Compatibility: The holster profile is cut to clear most popular pistol-mounted red dot optics used on Glock pistols. Supported Glock Pistols The 4BROS Glock RaceCar Appendix Rig is available for several popular Glock concealed carry and duty pistols. Each holster is precision-molded to the exact firearm or firearm and weapon light combination selected from the dropdown menu to ensure proper fit and retention. Glock 17 Glock 19 Glock 19X Glock 45 Glock 47 Glock 43X MOS Glock 48 MOS Glock 34 Supported Weapon Light Configurations Light-bearing RaceCar Appendix Rig models retain on the weapon-mounted light instead of the pistol frame. This allows consistent retention and repeatable indexing across supported firearm and light combinations. Glock 19 + Streamlight TLR-7A Glock 19 + Streamlight TLR-7X Glock 19 + Streamlight TLR-7 HL-X Glock 19 + Surefire X300U (A & B) and  X300T (A & B) Glock 17 + TLR-1 HL Glock 17 + Streamlight TLR-7A Glock 17 + Streamlight TLR-7X Glock 17 + Streamlight TLR-7 HL-X Glock 17 + Surefire X300U (A & B) and  X300T (A & B) Glock 47 + Surefire X300U (A & B) and  X300T (A & B) Glock 19X + Streamlight TLR-7A Glock 45 + Streamlight TLR-1 HL Glock 45 + Streamlight TLR-7A Glock 45 + Streamlight TLR-7 HL-X Glock 45 + Surefire X300U (A & B) and  X300T (A & B) Glock 47 + TLR-1 HL Glock 47 + TLR-7 A Glock 47 + TLR-7 X Glock 47 + TLR-7 HL-X Glock 47 + Surefire X300U (A & B) and  X300T (A & B) Glock 43X MOS + Streamlight TLR-7 Sub  Glock 43X MOS + Streamlight TLR-7 HL-X Sub Glock 48 MOS + Streamlight TLR-7 Sub  Glock 48 MOS + Streamlight TLR-7 HL-X Sub Glock 43X MOS & TLR-8 Sub Glock 48 MOS & TLR-8 Sub Glock 34 + Surefire X300U (A & B) and  X300T (A & B) Compatible lights available from Four Brothers: 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 Streamlight TLR-7 HL-X Sub USB, Part# 69503 which can be purchased from us HERE. Compatible Glock models configured with the SureFire X300U-B weapon light feature secure light-based retention for consistent performance and repeatable indexing. Made in the USA The 4BROS Glock 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 Glock RaceCar Appendix Rig? The RaceCar Appendix Rig is an IWB (Inside Waistband) sidecar-style appendix holster designed specifically for Glock pistols. It features adjustable spacing between the holster and magazine carrier for improved comfort, concealment, and customization. What makes the RaceCar Appendix Rig different from traditional sidecar holsters? Unlike fixed sidecar designs, the RaceCar Appendix Rig uses a flexible 4BROS RaceCar Injection-Molded Appendix Adapter Plate that allows the holster and magazine carrier to move naturally with the body. This improves comfort during movement, seated carry, and extended daily wear. What pistols and lights does this holster support? The RaceCar Appendix Rig supports several popular Glock pistol and weapon light combinations listed in the supported fitment section above. Each holster is custom-built for the selected configuration to ensure proper fit and retention. How does retention work? For light-bearing configurations, retention is indexed on the weapon-mounted light. Non-light-bearing models retain directly on the firearm. 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. The spacing between the components is also adjustable to help optimize comfort and concealment. 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 Glock pistols. What if my Glock configuration is not listed? If your pistol or weapon light configuration is not shown, contact the 4BROS holster support team. Additional configurations may already be supported or under evaluation.