---
product_id: 10332877
title: "JBU JB39 CQB FIRSH Olympic Arms Trademark Conversion Kit for MIL4 Airsoft AEG"
brand: "jbu"
price: "107900 Ft"
currency: HUF
in_stock: true
category: "Sports"
url: https://www.desertcart.hu/products/10332877-jbu-jb39-cqb-firsh-olympic-arms-trademark-conversion-kit-mil4
store_origin: HU
region: Hungary
---

# JBU JB39 CQB FIRSH Olympic Arms Trademark Conversion Kit for MIL4 Airsoft AEG

**Brand:** jbu
**Price:** 107900 Ft
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** JBU JB39 CQB FIRSH Olympic Arms Trademark Conversion Kit for MIL4 Airsoft AEG by jbu
- **How much does it cost?** 107900 Ft with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hu](https://www.desertcart.hu/products/10332877-jbu-jb39-cqb-firsh-olympic-arms-trademark-conversion-kit-mil4)

## Best For

- jbu enthusiasts

## Why This Product

- Trusted jbu brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

Our take:�� This free-float rail kit comes with everything you need to convert your standard M4 rifle into an ultra-lightweight CQB AEG, including a replica of the highly sought-after Free-float Integrated Rail System Handguard (FIRSH).� The included FIRSH handguard is licensed under Olympic Arms and is CNC machined from lightweight aluminum.� With over 28 inches of rail space, you can easily attach a wide variety of external accessories, including vertical grips, tactical flashlights and laser units.� The free-float quad rail is much more studier than standard M4 rail systems, eliminating any sign of wobble.� This conversion kit also comes with a CQB outer barrel that will fit standard M4s and a tight bore barrel with an internal diameter of 6.03mm, providing improved accuracy and increased FPS.Additionally, the FIRSH conversion kit includes a 9-inch barrel extension, crafted out of durable aluminum.� All necessary components for installation are included, such as a CNC machined barrel nut, tightening tool, tension bolts and Allen wrench.� This is the perfect addition to your standard M4 AEG, providing a modern look and modular capabilities.� The JBU Free-Floating Integrated Rail System Handguard Conversion Kit should be compatible with most metal gearbox M4 AEGs, with no modification required. Professional installation is recommended for anyone unfamiliar with installing a new rail interface system.Features:- Full metal construction- CNC-machined FIRSH handguard (7.125� in.)- Fits most full metal M4 style AEGs- 28 inches of rail space- Tight bore barrel, with 6.03mm diameter- CQB outer barrel- 9-inch barrel extension-Olympic Arms logo engravingPackage includes:� Free float

## Features

- Fits MIL4 style AEG's
- MIL4 CQB Conversion Kit
- Includes:  FIRSH handguard, outer barrel, inner barrel and universal barrel wrench.
- Also includes:  Barrel extension accessory
- Olympic Arms Logo Engraving

## Images

![JBU JB39 CQB FIRSH Olympic Arms Trademark Conversion Kit for MIL4 Airsoft AEG - Image 1](http://ecx.images-amazon.com/images/I/31az1E7usoL.jpg)

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**Shop now:** [https://www.desertcart.hu/products/10332877-jbu-jb39-cqb-firsh-olympic-arms-trademark-conversion-kit-mil4](https://www.desertcart.hu/products/10332877-jbu-jb39-cqb-firsh-olympic-arms-trademark-conversion-kit-mil4)

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*Product available on Desertcart Hungary*
*Store origin: HU*
*Last updated: 2026-01-23*