ProWin / Dytac CNC Hopup Chamber for M4/M16 Series Airsoft AEG Rifles

"MUST READ!!!!!!!!!
This hop-up chamber is the best. Hands down. But do not buy this if you don't know how to tune a hop up. This unit does not sit perfectly with the spring around the barrel in most guns. It performs best with 2-4 small o-rings in front of it on the barrel.

My setup includes three o-rings in front of the unit with a lonex 70 degree bucking and a flat hop, partnered with an m-140 spring pushing upgraded parts I won't bore you with. This is the BEST hop-up you can get for an upgraded high quality gun. But if you are looking for a hop-up to just drop in, get the lonex hop-up. That will work great.

"I can't really give it an accurate rating due to the fact that it absolutely will not fit in a kwa but ill give it the benefit of the doubt based on my friends time with it. I learned that the hard way. Don't waste your time or money if you plan on getting this for a kwa.

"absolutely amazing hopup. really easy to install. super easy to flat/R-HOP. just use a quality bucking and barrel and you should have great results. not much else to say.
pro: easy install.
easy flat/r hop mod.

con.
none

"Great Hop up, easy to assemble and install and with maple leaf 75* bucking and h nub ranges to 200 ft with superb accuracy and even 250 if needed. One word of caution, as i found out when it was not feeding right, on certain barrels and certain combos the maple leaf bucking lip sticks out barely into the feed tube and can cause jams, but rarely and just need to file the barrel down so the lip sits slightly farther back. Great Hop up!

"Very few products work so well I can't imagine what I did before you had one. The ProWin hop up was easy to assemble, and out shined my stock G&P hop with the 3 gear system, first mag fired following install. With almost no adjustment, this hopup delivers BB's consistently on target. It's expensive and it's fricken blue..and people might tell you that a standard hop works just fine, why spend the money. (well, some people anyway) But this thing fricken works. I went from flinging BB's 30-40ft before they split off the plan and did their own thing, to mowing down fools at or beyond 100ft before having to worry about the shots losing energy and breaking out or dropping off. Just got back from a full day of at the field, very successful upgrade. If you're wanting an upgrade you don't have to mess with, just works, increases range and accuracy and doesn't require re-adjustment during, or after each battle..buy this. It's fricken blue, and it's expensive, and anyone with an M4 should have one.

-My rifle:
G&P Evike Rapid Fire II
Angel Custom hop up nub
G&P 60deg bucking
stock barrel

"This is a great hop up system. Extremely accurate my m4 s system is dead on now. However I must note it's compatibility that when my gear box shattered I replaced it with a dboys one and the gun would either not fire double feed or compression would be awful. The key to making it work with a dboys gearbox is to attach a metal washer around the hop up lip that goes into the gearbox that way the air nozzle is at the perfect length for feeding compression and this function flawless. Upon doing this I've never had a misfeed or jam. My accuracy even at 200 ft is spot on 9/10 shots. Buy this angel customs 6.01 tight bore and maple leaf hop up and flat hop it and you'll see what I'm talking about

"I just recieved this hop up chamer and my g*d, the feel and look of it is 100%.
When i recieved it i got all the parts needed to assemble it, even though its spesificly written that theese do not come with it, just the hop up unit itself. Assembly is straight forward and took no more than a coupple of minutes at most.

When i fire the gun however it doubble feeds on every other shot i take, but this i think is the air nozzle and not the hop up unit itself, so ill order up a new nozzle and test it out.

Pro's:

CNC - built like a tank
Great looking, nice colour that adds a bit of bling
Came with all the part to assemble it (O-ring, wheel, you name it)

Con's:

None that i can see right away exept for the gun doubble feeds (but i dont think the unit is responsible for this)


all in all i would say this is a pretty nice hop up chamber and would recomend it to others to buy

"I have already reviewed this, but I wanted to add that it works with a Maple leaf 75 degree bucking, nub and an angel customs 6.01 barrel.

I also recommend 5.98 max precision BB's at .25 grams

"Comment on review above, then review
- Feeding issues other than no feeding at all are caused by the bucking characteristics, air nozzle, and tappet plate. Not the hop up unit.

Pros Works great, and retains setting
Cons the adjustment screw for the hop up unit retention is finicky

-For use in ICS guns you need to shim the unit forward with a neoprene washer then you can replace the nozzle with a TM spec air nozzle.
--additional note, I use G&P magazines that required a 1/16 washer to feed well.

"This is a great hop up chamber! I installed it in my Polarstar and it feeds flawlessly. It's got a very precise adjustment so I can get the perfect amount of hop for my BB's and it also looks awesome when I pull back the charging handle. All in all I think this chamber is well worth the money I paid!

"Put this in a JG SR25 and it increase the shot accuracy and range like crazy. Added about another 15 feet in overall range and made my effective range around 10 feet further. Pair this with a good bucking, I recommend Prometheus Purple or Krytac (Hard or Soft, Depends On Your FPS).

Pros:
Better Airseal Than Stock
High Custom Compatibility(Allows Easy Rhop and Flat Hop)

Cons:
Tall Nub Housing, would not fit in my Classic Army ARS3(Reason I Bought It)(It sits up too high at the top)

"Great hop up unit once you tinker with it. Does not work the greatest with G&G cm16's but does work pretty good on my Elite Force 4CRL. Definitely would recommend getting a VFC bucking or a Maple Leaf AST Macaron ribbed bucking. I was getting around 380-386 fps with both of these combos of buckings in the prowin.

"For all intents and purposes, this is a great hop-up. However, it does NOT come with the small spring that pushes the hop-up unit against the cylinder nozzle ( I think that's the right part...) and you can run into some compression problems because of this. It does come with some small screws that allow you to attach a spring, so if you're replacing your stock hop-up, keep that little spring at the front of the stock unit, and twist it onto one of those little screws and install it onto the ProWin. This is especially important if you're using midcaps, and even more so if you intend to get the new PTS EPM1's, because the springs in those things are monsters.

"Simple hop up, I had to modify it slightly for my I.C.S tubular M4 as some of the housing of the hop up contacted the lower receiver resulting in miss feeding. Easy fix though I used this with a Maple leaf tight bore and hop rubber.

"Simple hop up, I had to modify it slightly for my I.C.S tubular M4 as some of the housing of the hop up contacted the lower receiver resulting in miss feeding. Easy fix though I used this with a Maple leaf tight bore and hop rubber.