Our take: Element's performance 6.04mm series of tight bore barrels are the value-leader in the market, providing a quality tight bore performance barrel at the absolute lowest price on the market. These are coated for for high lubricity and performance, and increase performance (power and accuracy) with proper installation.
The super slick performance finish strengthens and protects the barrel, while reducing friction (conserves velocity & back spin). This 230mm barrel fits most M5-A4, -A5, -SD5, -SD6, and M5-J metal gearbox AEGs.
Precision manufactured to ensure tolerance and high quality.
Note: Ready to use right out of the box, though professional installation is recommended/may be required. Please use only ultra high-quality precision seamless BBs in your gun after installing this barrel, as inferior grade BBs (i.e. BBs from sporting goods stores) WILL jam inside this barrel.