Prometheus Air Seal Chamber Hop-Up Bucking

The 50-degree rating indicates a softer rubber compound, which is ideal for lower-FPS builds or cooler weather conditions. This softness provides better grip on the BB for consistent backspin, though it may wear out faster than harder, 70-degree alternatives.

This bucking is designed for standard AEG inner barrels with conventional hop-up windows. It is widely compatible with most major brands, but it will not fit specialized proprietary hop-up systems or barrels designed for flat-hop or R-hop setups.

Yes, it is highly recommended to use the included nub. Prometheus designs the bucking and nub to work as a matched system to ensure optimal pressure is applied to the BB for consistent trajectory.

You should replace your bucking if you notice inconsistent FPS, flyers, or if the rubber shows visible signs of tearing or hardening. For active players, replacing it once or twice a year is a good preventative maintenance habit to keep your accuracy sharp.

Because this is a 50-degree soft bucking, it is generally better suited for standard to lower-FPS setups. If you are running a high-FPS build, you may find that this softer rubber deforms too easily, leading to inconsistent hop; a harder bucking would be a better choice in that scenario.