{"product_id":"4bros-rost-martin-racecar-appendix-rig","title":"4BROS Rost Martin RaceCar Appendix Rig","description":"\u003ch2\u003e4BROS Rost Martin RaceCar Appendix Rig – IWB Sidecar Holster for Rost Martin Pistols\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBuilt for comfort, concealment, and adaptability.\u003c\/strong\u003e The 4BROS Rost Martin RaceCar Appendix Rig is an \u003cstrong\u003eIWB (Inside Waistband)\u003c\/strong\u003e appendix sidecar holster system designed specifically for Rost Martin 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.\u003c\/p\u003e\n\u003ch3\u003eDesigned for Comfortable Appendix Carry\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003ch3\u003eQuick Overview\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFlexible 4BROS RaceCar Injection-Molded Appendix Adapter Plate\u003c\/li\u003e\n\u003cli\u003eAdjustable spacing between the holster and magazine carrier\u003c\/li\u003e\n\u003cli\u003eAdjustable cant and ride height for both holster and mag carrier\u003c\/li\u003e\n\u003cli\u003eDesigned to improve comfort during seated carry and daily movement\u003c\/li\u003e\n\u003cli\u003eCompatible with red dot optics and suppressor-height sights\u003c\/li\u003e\n\u003cli\u003eRetention indexed on supported weapon-mounted lights\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eEquipped with Discreet Carry Concepts 1 Series Overhooks and a MODwing concealment wing, the 4Bros 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.\u003c\/p\u003e\n\u003cp\u003eInformation on the belt attachments used for the 4BROS RaceCar Appendix Rigs can be found through our \u003ca href=\"https:\/\/fourbrothersinc.com\/blogs\/news\/inside-waistband-belt-or-no-belt-attachments\" title=\"Learn about inside waistband belt attachments for RaceCar appendix holsters\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eInside Waistband Attachments Blog article\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eUnlike traditional fixed sidecar holsters that can feel rigid during daily carry, the RaceCar Appendix Rig utilizes a flexible \u003cstrong\u003e4BROS RaceCar Injection-Molded Appendix Adapter Plate\u003c\/strong\u003e 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.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4BROS RaceCar Injection-Molded Appendix Adapter Plate\u003c\/strong\u003e – 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Sidecar Spacing\u003c\/strong\u003e – Customize the distance between the holster and magazine carrier to optimize concealment, comfort, and carry positioning for different body types and carry preferences.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Cant \u0026amp; Ride Height\u003c\/strong\u003e – Fine-tune the draw angle and carry height of the holster to improve concealment, reduce firearm printing, and establish a consistent draw stroke.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Magazine Carrier Height \u0026amp; Cant\u003c\/strong\u003e – Customize the magazine carrier's ride height and angle to improve accessibility, comfort, and concealment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized for Daily Carry\u003c\/strong\u003e – Designed to reduce hot spots and pressure points commonly associated with appendix carry while maintaining stability during movement, seated carry, and extended wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBelow-the-Beltline Bridge Design –\u003c\/strong\u003e 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetention on the Light (Light-Bearing Models)\u003c\/strong\u003e – Compatible weapon-mounted light configurations provide secure retention, repeatable indexing, and consistent draw performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Molded Fitment\u003c\/strong\u003e – Each holster is custom-formed to the exact firearm and weapon light combination selected to ensure proper retention, clearance, and reliability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptics Ready Design\u003c\/strong\u003e – Compatible with most popular pistol-mounted red dot optics commonly used on Staccato pistols.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuppressor Height Sight Compatible\u003c\/strong\u003e – Compatible with most standard and suppressor-height iron sights used on modern defensive pistols.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSupported Rost Martin Pistols\u003c\/h3\u003e\n\u003cp\u003eThe 4BROS Rost Martin RaceCar Appendix Rig is available for select Rost Martin concealed carry 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.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRost Martin RM1C\u003c\/li\u003e\n\u003cli\u003eRost Martin RM1F\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"ql-heading ql-show-draggable-anchor\"\u003eComplete Your Carry Setup\u003c\/h3\u003e\n\u003cdiv class=\"ql-block\"\u003eComplete your concealed carry setup with purpose-built accessories designed for comfort, concealment, and everyday use.\u003c\/div\u003e\n\u003cdiv class=\"ql-block\"\u003e\n\u003ca class=\"ql-link\" href=\"https:\/\/fourbrothersinc.com\/products\/4bros-holster-wedge\" rel=\"noopener noreferrer\" target=\"_blank\"\u003e4Bros Holster Wedge\u003c\/a\u003e — Designed to improve concealment and comfort by helping angle the firearm grip closer to the body while reducing pressure points during IWB carry.\u003c\/div\u003e\n\u003cdiv class=\"ql-block\"\u003e\u003c\/div\u003e\n\u003ch3\u003e\n\u003cspan style=\"font-size: 0.875rem;\"\u003eAdditional Resources:\u003c\/span\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003eInformation on available holster color options is available in our \u003ca href=\"https:\/\/fourbrothersinc.com\/blogs\/news\/holster-colors\" title=\"Guide to Kydex holster colors and pattern options\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eHolster Colors Guide\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eView additional compatible appendix carry options in the \u003ca href=\"https:\/\/fourbrothersinc.com\/collections\/4bros-racecar-appendix-rig-collection\" title=\"Browse the complete 4BROS RaceCar Appendix Rig collection for concealed carry appendix holster setups\" rel=\"noopener noreferrer\" target=\"_blank\"\u003e4BROS RaceCar Appendix Rig Collection\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003ePrecision Fitment for Rost Martin Pistols\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003ePistol Fitment:\u003c\/strong\u003e Each holster is precision-formed to the exact Rost Martin pistol or pistol\/light combination selected from the dropdown menu to ensure proper fit and retention.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMagazine Carrier:\u003c\/strong\u003e The included magazine carrier is matched to your selected firearm platform and features adjustable retention through a side-mounted tension screw.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOptics Compatibility:\u003c\/strong\u003e The holster profile is cut to clear most popular pistol-mounted red dot optics used on Rost Martin pistols.\u003c\/p\u003e\n\u003ch3\u003eMade in the USA\u003c\/h3\u003e\n\u003cp\u003eThe 4BROS Rost Martin RaceCar Appendix Rig is proudly manufactured in Logansport, Indiana using premium materials, precision CNC-cut components, and purpose-built forming processes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePro Tip:\u003c\/strong\u003e Apply a removable thread locker to all hardware screws after final adjustment to help prevent loosening over time.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat is the 4BROS Rost Martin RaceCar Appendix Rig?\u003c\/h3\u003e\n\u003cp\u003eThe RaceCar Appendix Rig is an IWB (Inside Waistband) sidecar-style appendix holster designed specifically for Rost Martin pistols. It features adjustable spacing between the holster and magazine carrier for improved comfort, concealment, and customization.\u003c\/p\u003e\n\u003ch3\u003eWhat makes the RaceCar Appendix Rig different from traditional sidecar holsters?\u003c\/h3\u003e\n\u003cp\u003eUnlike 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.\u003c\/p\u003e\n\u003ch3\u003eWhat pistols and lights does this holster support?\u003c\/h3\u003e\n\u003cp\u003eEach holster is custom-built to the exact Rost Martin pistol and supported weapon-mounted light selected from the dropdown menu to ensure proper fit and retention.\u003c\/p\u003e\n\u003ch3\u003eHow does retention work?\u003c\/h3\u003e\n\u003cp\u003eFor 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.\u003c\/p\u003e\n\u003ch3\u003eIs the holster adjustable?\u003c\/h3\u003e\n\u003cp\u003eYes. 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.\u003c\/p\u003e\n\u003ch3\u003eWill this holster work with red dot optics?\u003c\/h3\u003e\n\u003cp\u003eYes. The holster profile is designed to clear most popular pistol-mounted red dot optics commonly used on Rost Martin pistols.\u003c\/p\u003e\n\u003ch3\u003eWhat if my Rost Martin configuration is not listed?\u003c\/h3\u003e\n\u003cp\u003eIf your pistol or weapon light configuration is not shown, \u003ca href=\"https:\/\/fourbrothersinc.com\/pages\/contact-us\" title=\"Contact the 4BROS holster support team for Staccato fitment questions\" rel=\"noopener noreferrer\" target=\"_blank\"\u003econtact the 4BROS holster support team\u003c\/a\u003e. Additional configurations may already be supported or under evaluation.\u003c\/p\u003e","brand":"4Bros","offers":[{"title":"Rost Martin RM1C \/ .093 Black \/ Right Hand","offer_id":53986939994412,"sku":"4BR-RM1C-RCR-4BRMP3-1","price":150.0,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1C \/ .093 Black \/ Left Hand","offer_id":53986940027180,"sku":"4BR-RM1C-RCR-4BRMP3-2","price":150.0,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1C \/ .093 Black Carbon Fiber \/ Right Hand","offer_id":53986940059948,"sku":"4BR-RM1C-RCR-4BRMP3-3","price":165.0,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1C \/ .093 Black Carbon Fiber \/ Left Hand","offer_id":53986940092716,"sku":"4BR-RM1C-RCR-4BRMP3-4","price":165.0,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1C \/ .093 FDE \/ Right Hand","offer_id":53986940125484,"sku":"4BR-RM1C-RCR-4BRMP3-5","price":157.5,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1C \/ .093 FDE \/ Left Hand","offer_id":53986940158252,"sku":"4BR-RM1C-RCR-4BRMP3-6","price":157.5,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1C \/ .093 OD Green \/ Right Hand","offer_id":53986940191020,"sku":"4BR-RM1C-RCR-4BRMP3-7","price":157.5,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1C \/ .093 OD Green \/ Left Hand","offer_id":53986940223788,"sku":"4BR-RM1C-RCR-4BRMP3-8","price":157.5,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1C \/ .093 Storm Grey \/ Right Hand","offer_id":53986940256556,"sku":"4BR-RM1C-RCR-4BRMP3-9","price":157.5,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1C \/ .093 Storm Grey \/ Left Hand","offer_id":53986940289324,"sku":"4BR-RM1C-RCR-4BRMP3-10","price":157.5,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1C \/ .093 Coyote Brown \/ Right Hand","offer_id":53986940322092,"sku":"4BR-RM1C-RCR-4BRMP3-11","price":157.5,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1C \/ .093 Coyote Brown \/ Left Hand","offer_id":53986940354860,"sku":"4BR-RM1C-RCR-4BRMP3-12","price":157.5,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1C \/ .093 Blood Red \/ Right Hand","offer_id":53986940387628,"sku":"4BR-RM1C-RCR-4BRMP3-13","price":157.5,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1C \/ .093 Blood Red \/ Left Hand","offer_id":53986940420396,"sku":"4BR-RM1C-RCR-4BRMP3-14","price":157.5,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1F \/ .093 Black \/ Right Hand","offer_id":53986940453164,"sku":"4BR-RM1C-RCR-4BRMP3-15","price":150.0,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1F \/ .093 Black \/ Left Hand","offer_id":53986940485932,"sku":"4BR-RM1C-RCR-4BRMP3-16","price":150.0,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1F \/ .093 Black Carbon Fiber \/ Right Hand","offer_id":53986940518700,"sku":"4BR-RM1C-RCR-4BRMP3-17","price":165.0,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1F \/ .093 Black Carbon Fiber \/ Left Hand","offer_id":53986940551468,"sku":"4BR-RM1C-RCR-4BRMP3-18","price":165.0,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1F \/ .093 FDE \/ Right Hand","offer_id":53986940584236,"sku":"4BR-RM1C-RCR-4BRMP3-19","price":157.5,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1F \/ .093 FDE \/ Left Hand","offer_id":53986940617004,"sku":"4BR-RM1C-RCR-4BRMP3-20","price":157.5,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1F \/ .093 OD Green \/ Right Hand","offer_id":53986940649772,"sku":"4BR-RM1C-RCR-4BRMP3-21","price":157.5,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1F \/ .093 OD Green \/ Left Hand","offer_id":53986940682540,"sku":"4BR-RM1C-RCR-4BRMP3-22","price":157.5,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1F \/ .093 Storm Grey \/ Right Hand","offer_id":53986940715308,"sku":"4BR-RM1C-RCR-4BRMP3-23","price":157.5,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1F \/ .093 Storm Grey \/ Left Hand","offer_id":53986940748076,"sku":"4BR-RM1C-RCR-4BRMP3-24","price":157.5,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1F \/ .093 Coyote Brown \/ Right Hand","offer_id":53986940780844,"sku":"4BR-RM1C-RCR-4BRMP3-25","price":157.5,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1F \/ .093 Coyote Brown \/ Left Hand","offer_id":53986940813612,"sku":"4BR-RM1C-RCR-4BRMP3-26","price":157.5,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1F \/ .093 Blood Red \/ Right Hand","offer_id":53986940846380,"sku":"4BR-RM1C-RCR-4BRMP3-27","price":157.5,"currency_code":"USD","in_stock":true},{"title":"Rost Martin RM1F \/ .093 Blood Red \/ Left Hand","offer_id":53986940879148,"sku":"4BR-RM1C-RCR-4BRMP3-28","price":157.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0251\/3633\/2875\/files\/4Bros_Black_Red_White_COMING_SOON_64f0a8e1-b5c4-4e9f-816e-fc8b35749307.jpg?v=1776786577","url":"https:\/\/fourbrothersinc.com\/products\/4bros-rost-martin-racecar-appendix-rig","provider":"Four Brothers","version":"1.0","type":"link"}