Features Cut to work with most standard TM-Spec Airsoft gas guns Precision 6.03mm inner diameter Includes 60 degree hop-up bucking Perfect as a drop-in installation to improve the accuracy and precision of your favorite gas rifles and pistols Durable brass construction TITAFLON coating reduces friction as the BB passes through your inner barrel Manufacturer: Unicorn Airsoft Specifications: Length: 129mm Inner Diameter 6.03mm Bucking Hardness: 60 Degree Compatibility: For Tokyo Marui, KJW, and Other Compatible GBB Airsoft Guns Material: Brass, Rubber Package Includes: Barrel, Hop-Up Bucking ⬇️ Check my page for other items of interest! I combine shipping on multiple orders whenever possible, and will accept reasonable offers.