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ProWin Hopup Chamber for AK Series Airsoft AEG Rifles
8 Customer Reviews
by Michael L. on 02/21/2025
"This is the best AK hopup and ive used it in my CYMA builds, it solves the shifting gearbox problem with newer AKs (without 4 bottom receiver screws, non TM) but it doesnt fit LCT aks. It changes the distance of the hopup bucking to the gearbox, and the magazine well feeding tube positioning.
I have builds that have a 1 FPS variance between all shots because of it that can stack BBs on top of each other at long ranges.
I have builds that have a 1 FPS variance between all shots because of it that can stack BBs on top of each other at long ranges.
by Charles L. on 07/04/2021
"Reason why I bought this: Built a Cyma AKs74u with a Polar star Jack in it. Was having issues with the nozzle staying aligned to the hop-up and barrel.
Outcome: I DID have to file down the top screw on the gearbox where the nozzle is (I knew that going in based on the dimensions of the gearbox and what I saw on the pictures for this item). Once I slowly filed down the gearbox, slowly and patiently checking when the hop-up slid in with very little resistance. I put it all together. And it all lined up perfectly (I did have to add electrical tape shims on the bottom of the gearbox since the nozzle gets pulled down when you tighten the grip screw, hop-up had nothing to do with this).
Over all review: very good hop up. Has good alignment. You may need to file down the feed hole (before the feed stopper) on your mags to have a smoother reload. All parts from the plastic Cyma hop up fit it perfectly.
Side note, the extrusion where the hop up meets the gearbox will not make full contact (be flush) with the gearbox, this is normal
My 74u is happy, I am happy.
Outcome: I DID have to file down the top screw on the gearbox where the nozzle is (I knew that going in based on the dimensions of the gearbox and what I saw on the pictures for this item). Once I slowly filed down the gearbox, slowly and patiently checking when the hop-up slid in with very little resistance. I put it all together. And it all lined up perfectly (I did have to add electrical tape shims on the bottom of the gearbox since the nozzle gets pulled down when you tighten the grip screw, hop-up had nothing to do with this).
Over all review: very good hop up. Has good alignment. You may need to file down the feed hole (before the feed stopper) on your mags to have a smoother reload. All parts from the plastic Cyma hop up fit it perfectly.
Side note, the extrusion where the hop up meets the gearbox will not make full contact (be flush) with the gearbox, this is normal
My 74u is happy, I am happy.
by Steven Z. on 01/06/2020
"Fit my E&L aks74u with prommy barrel but now I cant screw down the whole front part of the gun LMAO
by patricio m. on 05/22/2019
"Me llegó está cámara y me llegó incompleta, en la página también, se ve el producto le faltan partes, quisiera saber si la venden así?.
by Samuel B. on 01/09/2018
"I run an E&L Spartan Delta that was 100% stock before this hop up. Before installation, my shots were accurate but not 100% consistent. I heard they have fitting issues, but i can guarantee it fits like a glove in E&L's. After installing the hop up, my shots were alot more consistent. ProWins are a really good hopup.
by Louis A. on 02/15/2016
"NOTE: You are going to need your dremel (or a hack saw) and/or file to cut out a notch to clear the screw at the top front of your gearbox. It's actually much easier than explaining it.
Once done, I can't believe how much better my JG AK-74u performed. All the feeding problems were gone, and the trajectory seemed more consistent. Mind you, I coupled it with a 6.03 barrel and G&G green bucking.
Beautifully machines and finished, I totes recommend it.
Once done, I can't believe how much better my JG AK-74u performed. All the feeding problems were gone, and the trajectory seemed more consistent. Mind you, I coupled it with a 6.03 barrel and G&G green bucking.
Beautifully machines and finished, I totes recommend it.
by Andrew V. on 02/29/2020
"Not a terrible hop up I suppose, build quality is great, feels nice and durable while tuning on the fly. BUT when I installed this into my LCT vityaz, I started getting all sorts of feed issues I wasn’t having before. Good hopup just not for all guns
by Anthony S. on 10/21/2014
"I am giving this a bad review because it does not fit on my cyma gearbox. There is a cut out on this hop up unit that goes around the top screw point of the V3 gear box and it doesnt. The cut out is not big enough. I wish i could post a picture to show what im talking about. I dont know how it performs so yeah... I dont know if it is just a problem with mine or not, buts its something to consider. Im really dissapointed by this.