Free Shipping on Orders Over $99 with Coupon Code: FREESHIP for lower 48 states in the U.S.*.  No in-store services, please stay in the car for curbside pickup. Call 562-287-8918, we will bring the items out for you.

Madbull Airsoft 6.01mm Ultimate Tightbore Barrel - 300mm for M4 CQBR

SKU: JAG-MBBARL-ULT-300MM MadbullOut of stock

  • CNC machined aluminum
  • Precision 6.01mm diameter
  • Tight air seal construction
  • Smooth and slick surface
  • Hard anodized coating
  • Titanium color finish
  • Compatible with all AEGs with 300mm inner barrels


Madbull Airsoft 6.01mm Ultimate Tightbore Barrel - 300mm for M4 CQBR

These NEW 300mm Ultimate Tightbore Barrels by Madbull provide the tightest air seal for an AEG, ultimately improving muzzle velocity and performance. These enhanced inner barrels are precision machined from aluminum and sport a 6.01mm diameter, providing maximum accuracy and increased FPS in any AEG. Only precision grade BBs should be used with this inner barrel to avoid jamming. Measuring 300mm long, this tightbore barrel should be compatible with most hop-up systems and metal gearbox airsoft guns. Professional installation is recommended for anyone unfamiliar with installing a new inner barrel. Lastly, the super slick finish strengthens and protects the barrel, as well as minimizing overall friction. Maximize your AEG's performance by picking up Madbull’s Ultimate Tightbore Barrel today!

NOTE: This inner barrel is ready to use right out the packaging, though professional installation is recommended or may be required. Please only use high-quality precision seamless BBs in your airsoft gun after installing this barrel, as inferior grade BBs (i.e., ones from sporting goods stores) WILL jam inside this barrel.

In the Box


Material Aluminum Alloy
Diameter 6.01 mm
Weight 0.8 oz
Overall Length 300 mm

California Proposition 65 Warning: Cancer and Reproductive Harm -

Madbull Airsoft 6.01mm Ultimate Tightbore Barrel - 300mm for M4 CQBR Quick Compare

This feature is currently unavailable.

Rate & Write a Review


Rate & Write a Review

Product name Q&A


Click on link to download:

Connect with us.