The ProWin M4 / M16 CNC Hop Up Chamber is a great upgrade from your AEG's stock plastic, or weak cast metal hop up chamber. Metal hop up chambers are known for providing a better air seal against the AEG's gearbox, and feeding much more smoothly than plastic chambers. Many cast metal hop up chambers, however, have weak areas in the metal from the casting process, but this problem is completely eliminated with the ProWin chamber. This hop up chamber is machined completely out of aircraft grade aluminum, meaning it is both lightweight and durable, and the bright blue color helps give your AEG a custom look.
Posted by noah shaw on 13th Dec 2017
Even with a very short inner barrel the range exceeded most of my other guns
Posted by Michael on 23rd Nov 2017
Love the adjustment on this hop up unit.
Posted by Julius Blahovsky on 2nd Oct 2014
Straight forward fit into my G&P M4 moe.
Worked great with the original nozzle.
Worked again great when used with the P* FE.
I have used the PDI raven 303mm barrel a and systema energy bucking with very good results.
on 120psi blue nozzle 407fps with 0.20s and 330 fps with 0.40s.
Great air seal.
You cannot go wrong with this chamber.
All prices are in USD