This is considered one of the best buckings on the market for dropping into a flat-hop/R-Hop hop-up/barrel.
The Prometheus Blue Bucking is a high-quality upgrade part designed for airsoft guns that use R-Hopped AEG barrels. Made from durable and high-density silicone rubber material, this bucking provides a better air seal and improved consistency in shots, resulting in increased accuracy and range. Its blue color signifies a hardness of 50 degrees. If you are doing a flat-hop/r-hop build, consider buying this. If you are not doing a r-hop/flat-hop build, consider a Prometheus Purple.