WinPro HOP UP Chamber M4M16

The ProWin Hop up chambers have a reputation for being awesome. They're machined out of aluminum and have several features that set them leagues above the stock plastic hop units in most AEGs.This unit is a very tight fit in the ARES model I have, but that isn't necessarily bad. I know I'm getting a good seal against the hop rubber for every shot and that the unit itself isn't going to move anywhere and change the consistency of my compression.There's also an O-ring behind the rotary dial that ensures the setting on your unit will not move even with vigorous vibration. The unit also has a grub screw that you can tighten to sort of lock the hop arm in place.This thing is great if your looking for consistency in your hop. Pair it with a good bucking and a good nub (go for a flat hop/flat nub and an R-Hop if you can) and enjoy the increase in shot consistency.

Best upgrade I have made so far to my ALS airsoft battle machine.

No pros to this hop up other than the quality from the outside looks amazing.Cons- Doesn't feed. Doesn't come with a nub. Doesn't fit snug around a ZCI 6.02 Tightbore or a G&G stock 6.03 Tightbore. Came with a large bur in the feeding hole and I feel like for a $35 hop up I shouldn't have to shave it down myself, especially since it comes unassembled with no instructions for newer builders. Was going to run this in my cheap outdoor CM16 Raider-L, but it misfires, and when it does occasionally fire, the stock arm is too long to hit the nub of the bucking firing inaccurate, low fps shots that I can only assume is just as bad as dry firing the gun. I put back on my stock plastic hop up and it shot much better. Shame that its this bad of a unit, just buy a prowin, not this rep. Just don't buy it.

Well made but needs assembly instructions to be included

Extremely accurate paired up with the Prometheus purple bucking and a flat hop knub also with a tightbore you won't miss a shot. Unless your really bad

The inner diameter of the hop up chamber does not accept any AEG bucking. You can insert the barrel/bucking into the hopup but with the C clip in place it is impossible for any BB to pass into the bucking lips. I don't know if this is a defect or a problem with this version. Either way I can't tell because I had to wait to see a tech to tell me this and now I was 7 days past the return window and I can't exchange it for another one to try.I tried a Matrix hop up unit at the local airsoft store and it works flawlessly. I guess I'll just go with matrix instead, may be best for you to just do the same.

Dont buy this. It doesnt work get a krytac hop up unit better than this.