These NEW 363mm 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 363mm long, this tightbore barrel should be compatible with most hop-up systems and AEGs, especially M4A1 series airsoft rifles. 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 Madbullâ€™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.