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JBU F8R Free Floating M4 CQB Commando Handguard Front Conversion Kit


  • - Full metal construction
  • - CNC-machined design
  • - FIRSH handguard, w/ rail covers
  • - Steel flash hider and front iron sight
  • - Reinforced outer barrel
  • - 6.03mm internal diameter inner barrel
  • - Engraved Olympic Arms logo
  • - Compatible with most metal gearbox M4 AEGs (ICS, TM, CA, G&G)


JBU F8R Free Floating M4 CQB Commando Handguard Front Conversion Kit

This NEW CQB Commando conversion kit by JBU features a modular design and includes a full metal compact outer barrel, precision inner barrel, front iron sight and flash hider. Unlike standard handguards that come in two pieces, JBU’s FIRSH handguard is CNC-machined from a single piece of aluminum, making it much more durable than standard two-piece metal handguards. Thanks to the handguard’s free float design, it is much studier than standard M4 handguards and eliminates any sign of wobble. With more than 28 inches of rail space you can attach an array of accessories, including vertical grips, tactical flashlights and laser units.

JBU’s F8R kit also includes a reinforced outer barrel paired with a tight bore 6.03mm inner barrel, making your AEG shoot more accurately and with increased FPS. As an added feature, an alloyed armored flash hider is included, allowing you to completely convert the front of your M4 forward of the receiver. Additionally, this kit comes with a front iron sight (complete with taper pins) that is CNC-machined from lightweight aluminum and is adjustable for elevation. The JBU F8R Front Conversion Kit is compatible with most metal gearbox M4 AEG rifles manufactured by top-tier names like ICS, Tokyo Marui and G&G. This upgrade kit is perfect for any airsoft player with a standard M4 and looking to convert it to a CQB rifle with a modern look and modular capabilities. This conversion kit comes with everything you need to install right out of the box, including barrel wrench, barrel nut, set screws, taper pins and Allen key, however, professional installation may be required.

NOTE: Professional installation is recommended for anyone unfamiliar with installing a new rail interface system. Additionally, be sure to check your local laws and regulations regarding coloration of the tip of your airsoft gun. Because this tip included in this kit is not painted orange, modification of the flash hider included in this kit may be necessary before it is attached to your AEG.

In the Box

FIRSH handguard

outer barrel

inner barrel

front iron sight

flash hider

barrel nut

barrel wrench

taper pins

Allen key


Length 7” in. (handguard)
Construction Aluminum
Compatibility Most metal gearbox M4 AEG rifles
Weight 11.7oz (handguard)

California Proposition 65 Warning: Cancer and Reproductive Harm -

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