Prometheus Wide Use Rotary Style Hop-up Chamber for M4 AEG


This Prometheus chamber provides consistent and reliable results without any fancy gimmicks. The rotary dial provides a wide range of hop adjustment with a long window for a wide array of nubs. The c-clip locks down the barrel to eliminate any torsion or vibration. This has been our go-to hop-up unit over the years due to its performance, reliability, consistency, and ease of use. Great for ER-hops, R-hops, flat hops, Maple Leaf buckings, standard buckings, and more. 


  • Rotary style wheel for hop adjustment
  • Cast metal alloy body
  • Rigid c-clip
  • Easy to install / adjust
  • Wide compatibility 

*Inner barrel not included.