New Prowin AK hop up chamber wont chamber bbs

Sim123456 · August 4th, 2009, 14:31

Hi guys, I just received a new Pro-Win ak hop up chamber to replace my broken stock one. I have a technical question about it. Once installed correctly, it wont chamber any bbs. The only way I can make it fire a bb is by manualy placing a bb in the front of the chamber and place it on the gearbox air nozzle so that the bb is sandwiched between the air noozle and the hop up bucking. But with a magazine, there are 4 bbs chambering the tube under the hop up chamber (the one that goes in the magazine) and none of those bbs will sit between the air noozle and the hop up bucking. It seems that the first bb entering the tube of the hop up chamber will stop half way in the main chamber. With my stock platsic hop up, bbs are pourring freely in the chamber with a magazine loaded. Is this normal? What can I do? Thank you (and I already put some silicone oil in it, no changes)

MadMansGun · August 4th, 2009, 18:46

look for burrs in the "tube under the hop up chamber"
use a small round file to fix the problem

Sim123456 · August 4th, 2009, 19:46

Do you mean a rate tail? To open where it blocks?

pusangani · August 4th, 2009, 20:27

those hopups are known for this, get an element chamber, wayyyy better IMO

Sim123456 · August 4th, 2009, 21:53

ah... don't want to order a new one yet, but thanks for the advice!

Amos · August 4th, 2009, 22:09

Quote:

Originally Posted by pusangani

those hopups are known for this, get an element chamber, wayyyy better IMO

Fuck that noise.

Get a stock TM or if you want an upgraded chamber, the KA one is beautiful.

pusangani · August 4th, 2009, 23:19

Lol the airseal on the element is a lot better than stock tm or any of its clones 10-15 fps better actually never tried the ka one tho

Sim123456 · August 5th, 2009, 10:52

I removed some of the paint/material inside the tube with a rolled sandpaper. Now bbs are flowing freely inside the chamber, wich is good. Bad thing seems that the sealing is very poor. On my stock plastic chamber, I had to use silicone oil on the bucking to get it inside. This one, I can play with the barrel while inside. This what I guess made me lost a great deal of fps. Will silicone tape the hop up bucking so that it squiz thight in the chamber and see. Damn stupid metal hop up lol

Sim123456 · August 6th, 2009, 11:40

I puted teflon (and not silicone) tape around the hop up bucking, I removed the hop up system to ensure maximum fps, I cleaned throughtly the 6.00 inner barrel, but I'm still at 385fps, a bit far from the 550fps I was. Any ideas? Could this be just hop up related?

pusangani · August 6th, 2009, 11:56

a poor airseal with the new hopup would cause the fps to suffer yes.

Mitchell12 · August 6th, 2009, 12:09

That's weird my pro-win was supremely tight fitting. Guess it's bad QC.

Trader rating · August 6th, 2009, 12:34

best ak hop up out there is the red ebay banned one

and i also had issues with my pro-win, its in the garbage

pusangani · August 6th, 2009, 12:53

Quote:

Originally Posted by pawscal

best ak hop up out there is the red ebay banned one

and i also had issues with my pro-win, its in the garbage

that's the Element one I told him to get, best airseal ever

Sim123456 · August 6th, 2009, 20:30

On my next order, the Element one! Thanks guys

Sim123456 · August 9th, 2009, 18:41

Hi again guys, I did some more testing on the prowin hop up and I found something interesting: with a bb chamber between the air noozle and bucking, If I remove the magazine and put my thumb on the loading tube of the hop up chamber, I get results over 500fps. But with the magazine in, 370fps. Bad air seal between the loading tube and the mag? Or bad air seal inside the loading tube and the bbs?

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August 4th, 2009, 14:31	#1
Sim123456 Trader rating Join Date: Oct 2008 Location: Laval	New Prowin AK hop up chamber wont chamber bbs Hi guys, I just received a new Pro-Win ak hop up chamber to replace my broken stock one. I have a technical question about it. Once installed correctly, it wont chamber any bbs. The only way I can make it fire a bb is by manualy placing a bb in the front of the chamber and place it on the gearbox air nozzle so that the bb is sandwiched between the air noozle and the hop up bucking. But with a magazine, there are 4 bbs chambering the tube under the hop up chamber (the one that goes in the magazine) and none of those bbs will sit between the air noozle and the hop up bucking. It seems that the first bb entering the tube of the hop up chamber will stop half way in the main chamber. With my stock platsic hop up, bbs are pourring freely in the chamber with a magazine loaded. Is this normal? What can I do? Thank you (and I already put some silicone oil in it, no changes) Last edited by Sim123456; August 4th, 2009 at 14:34..

August 4th, 2009, 18:46	#2
MadMansGun Trader rating Join Date: Mar 2009 Location: Vancouver Island	look for burrs in the "tube under the hop up chamber" use a small round file to fix the problem __________________ I Support Capital Airsoft!

August 4th, 2009, 20:27	#4
pusangani Official ASC "Dumb Ass" Trader rating Join Date: Jan 2008 Location: Scarbrah, Ontario	those hopups are known for this, get an element chamber, wayyyy better IMO __________________

August 4th, 2009, 19:46	#3
Sim123456 Trader rating Join Date: Oct 2008 Location: Laval	Do you mean a rate tail? To open where it blocks?

August 4th, 2009, 21:53	#5
Sim123456 Trader rating Join Date: Oct 2008 Location: Laval	ah... don't want to order a new one yet, but thanks for the advice!

August 4th, 2009, 23:19	#7
pusangani Official ASC "Dumb Ass" Trader rating Join Date: Jan 2008 Location: Scarbrah, Ontario	Lol the airseal on the element is a lot better than stock tm or any of its clones 10-15 fps better actually never tried the ka one tho __________________

August 5th, 2009, 10:52	#8
Sim123456 Trader rating Join Date: Oct 2008 Location: Laval	I removed some of the paint/material inside the tube with a rolled sandpaper. Now bbs are flowing freely inside the chamber, wich is good. Bad thing seems that the sealing is very poor. On my stock plastic chamber, I had to use silicone oil on the bucking to get it inside. This one, I can play with the barrel while inside. This what I guess made me lost a great deal of fps. Will silicone tape the hop up bucking so that it squiz thight in the chamber and see. Damn stupid metal hop up lol

August 6th, 2009, 11:40	#9
Sim123456 Trader rating Join Date: Oct 2008 Location: Laval	I puted teflon (and not silicone) tape around the hop up bucking, I removed the hop up system to ensure maximum fps, I cleaned throughtly the 6.00 inner barrel, but I'm still at 385fps, a bit far from the 550fps I was. Any ideas? Could this be just hop up related?

August 6th, 2009, 11:56	#10
pusangani Official ASC "Dumb Ass" Trader rating Join Date: Jan 2008 Location: Scarbrah, Ontario	a poor airseal with the new hopup would cause the fps to suffer yes. __________________

August 6th, 2009, 12:34	#12
pawscal Guest Trader rating	best ak hop up out there is the red ebay banned one and i also had issues with my pro-win, its in the garbage

August 6th, 2009, 20:30	#14
Sim123456 Trader rating Join Date: Oct 2008 Location: Laval	On my next order, the Element one! Thanks guys

August 9th, 2009, 18:41	#15
Sim123456 Trader rating Join Date: Oct 2008 Location: Laval	Hi again guys, I did some more testing on the prowin hop up and I found something interesting: with a bb chamber between the air noozle and bucking, If I remove the magazine and put my thumb on the loading tube of the hop up chamber, I get results over 500fps. But with the magazine in, 370fps. Bad air seal between the loading tube and the mag? Or bad air seal inside the loading tube and the bbs?

New Prowin AK hop up chamber wont chamber bbs

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