How to Fit the FIRSTSPEAR Overlap Retro Fit Cummerbund Kit

By Blaze Defense Systems | Tactical Gear: Breaching Tools, QR Kits, Medical, Fire Suppression | Published: 2026-10-27

Category: How-to Guides

Learn how to install a FIRSTSPEAR Overlap Retro Fit Cummerbund Kit on your plate carrier, with step-by-step guidance and common mistakes to avoid.

Quick Answer

To fit a FIRSTSPEAR Overlap Retro Fit Cummerbund Kit, first confirm your plate carrier's attachment points, then route the cummerbund through the rear plate bag and secure the TUBES® connectors. Adjust the overlap panels for a snug, even fit.

Why Retrofit Instead of Buying a New Carrier

Retrofitting a cummerbund lets you upgrade your existing plate carrier with modern features like the FIRSTSPEAR 6/12™ system and TUBES® quick-release connectors. This can improve comfort and don/doff speed without the cost of a new carrier.

The overlap design provides a customizable fit, especially if you are between sizes or use different plate thicknesses. It also allows for easier side armor integration.

Compatibility Check Before You Start

Before ordering, verify that your plate carrier has compatible attachment points. The Overlap Retro Fit Kit is designed to work with carriers that accept standard MOLLE/PALS webbing or have a rear plate bag with pass-through slots.

If your carrier uses a different attachment system, you may need an adapter or a different kit. Check the manufacturer's specifications or contact Blaze Defense Systems for guidance.

Step-by-Step Installation Guide

Prepare Your Carrier: Remove any existing cummerbund or side straps from your plate carrier. Ensure the rear plate bag is accessible and the attachment points are clear. Check for any loose threads or damage on the attachment points before proceeding.
Route the Cummerbund: Insert one end of the Overlap Retro Fit Cummerbund through the rear plate bag's pass-through slot, from the inside to the outside. Repeat for the other side. Make sure the cummerbund is not twisted; the TUBES® connectors should face outward for easy access.
Secure the Front Attachment: Attach the front ends of the cummerbund to your plate carrier's front flap or buckles. Use the TUBES® connectors to click them into place. Double-check that the TUBES® are fully seated and locked; a partial connection can fail under stress.
Adjust the Overlap Panels: The overlap design allows you to adjust the fit. Pull the overlapping sections to tighten or loosen the cummerbund around your torso. Ensure it is snug but not restrictive. If you wear side armor, adjust the overlap to accommodate the armor thickness without creating pressure points.
Test the Fit and Function: Put on the carrier and perform a few movements—bend, twist, and reach. Confirm the cummerbund stays in place and the TUBES® are easy to release. Have a partner practice a rapid don/doff to ensure the quick-release works smoothly in an emergency.

Product Facts

FIRSTSPEAR® Overlap Retro Fit Cummerbund Kit: This kit uses FIRSTSPEAR's revolutionary 6/12™ and TUBES® systems. The 6/12™ system allows for flexible attachment of pouches, while TUBES® provide a quick-release mechanism for fast donning and doffing.
FIRSTSPEAR® Overlap Retro Fit Cummerbund Kit