This Prowin hopup unit is the absolute best I have ever owned. I have tried so many different hop up units like Prometheus, Madbull, Modify, etc. The thing that makes this unique is that it does not have a gear set, just one and the hopup arm. You can compare it to the Madbull ultimate hopup in terms of functionality. It fits snugly in TM or TM clone M4/M16 receivers.
- CNC machined, very well made.
- Does NOT have the feeding issues that the Madbull Ultimate Hopup has.
- Hop up cannot loosen and loose your zeroing
- Allows for very precise hop up adjustment
- Good grouping if you have a good bucking.
- Does not have a spring to push the hop up unit against the gearbox. It has a long grub screw instead.
- Can be a little expensive (Worth it in my opinion)
Rating: [5 of 5 Stars!]