Upgrade the internal barrel of your 400e Gen 1 or 2 Metal rifle with this complete barrel kit, available in your choice of Standard or Precision barrel type. This kit is specifically designed for compatibility with the 400e Gen 1 or 2 Metal, which has a 405mm barrel length. If you purchased a 400e Gen 1 Metal, which were sold up until September 2024, you should know that your rifle came with an older version of the Precision barrel. The older design is less consistent than the current Precision barrel kits offered. The Standard or the Precision barrel kit will provide a noticeable upgrade over the stock Gen 1 barrel. If you purchased your 400e Gen 2 Metal, which launched in October 2024, your rifle originally came with a Precision barrel if purchased between October 2024 and June 2025. Starting in July 2025, all 400e Gen 2 Metal rifles now come with a Standard barrel. Understanding when you bought your rifle will help determine which barrel you currently have, and which kit is best for you. The Standard Barrel Kit offers reliable performance and allows for greater flexibility with BB types. It's less sensitive to slight imperfections in BB shape or finish, making it a great option for casual target shooting and higher-volume use with a broader range of steel BBs. The Precision Barrel Kit is built to tighter tolerances and delivers improved accuracy and consistency. If you're looking to push the limits of the 400e’s capabilities in terms of precision, this is your kit. However, because of its tighter internal specs, we strongly recommend using only Barra .177 Caliber / 4.5mm Zinc-Plated Steel BBs. These BBs are precisely machined and polished to perform reliably in the Precision barrel and prevent feeding issues. Each kit includes all the necessary components to fully replace the barrel and install it correctly within your 400e Gen 1 or 2 Metal. Whether you're upgrading from Standard to Precision or simply switching to match your ammo and shooting style, this kit gives your rifle a new level of performance and customization.
