Airgun Technologies Uragan 2 Depinger Power level problems?

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MJMDP

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Nov 3, 2021
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Sines, Portugal
Hello all!

I have an Uragan 2 600 .22 that has been a great gun and has hundreds and hundreds of shots without a problem.
Since I have other PCPs I wanted my U2 to be my slug and slong distance "shooter".

After some fiddling I've finally came to a great tune for it. It shoots Zan 25.5gr at 1005fps like a laser. I was really happy with it, the only thing that always bothered me was the ping that it makes with every shot. Some months ago I bought a depinger for it from ebay, but never came about to install it, You have to dissasemble most of the gun to reach it. But today I finally had time, and the gun developed a really slow leak, I thought it was about time I installed the thing and made some maintnance to the gun.
I sucessfully intalled the depinger and put everything together again. Its so much better and quiter with the depinger!! And the leak is gone.

Now come the problems. My power went down. I was shooting 1000-1005fps and I went all the way down to 915fps. I went in again and adjusted the regulator but the max I could get was around 960fps, and at that speed the groups are bad. Slugs are really specific with speed in this gun.
I know I reduced the volume of the plenum with the depinger a bit, but should it matter that much? This platform platform is good for .30 at 100+Ft/lbs...

So now what do I do?

- Remove the depinger and go back to the last tune?
- Fiddle some more? (its a pain to degass and dissasemble for every regulator change, and the reg is already really open)
- I could adjust the hammer, but this gun has an assited valve, so It should not matter that much and it should break the valve easily at this power level.
- Buy an huma regulator? Its more compact, maybe I can get better numbers?

Any ideas?


20221117_111513.jpg
 
MJMDP said:
Hello all!

I have an Uragan 2 600 .22 that has been a great gun and has hundreds and hundreds of shots without a problem.
Since I have other PCPs I wanted my U2 to be my slug and slong distance "shooter".

After some fiddling I've finally came to a great tune for it. It shoots Zan 25.5gr at 1005fps like a laser. I was really happy with it, the only thing that always bothered me was the ping that it makes with every shot. Some months ago I bought a depinger for it from ebay, but never came about to install it, You have to dissasemble most of the gun to reach it. But today I finally had time, and the gun developed a really slow leak, I thought it was about time I installed the thing and made some maintnance to the gun.
I sucessfully intalled the depinger and put everything together again. Its so much better and quiter with the depinger!! And the leak is gone.

Now come the problems. My power went down. I was shooting 1000-1005fps and I went all the way down to 915fps. I went in again and adjusted the regulator but the max I could get was around 960fps, and at that speed the groups are bad. Slugs are really specific with speed in this gun.
I know I reduced the volume of the plenum with the depinger a bit, but should it matter that much? This platform platform is good for .30 at 100+Ft/lbs...

So now what do I do?

- Remove the depinger and go back to the last tune?
- Fiddle some more? (its a pain to degass and dissasemble for every regulator change, and the reg is already really open)
- I could adjust the hammer, but this gun has an assited valve, so It should not matter that much and it should break the valve easily at this power level.
- Buy an huma regulator? Its more compact, maybe I can get better numbers?

Any ideas?


View attachment 540498
Click to expand...
Zan 25.5s work great at 930 fps on mine. And 23 grains at 975 fps. I use it for 50 and 100m benchrest (local) competitions and have had lots of success at those speeds. Your initial tune sounds a bit too hot to me , but I know that doesn't answer your question. I would experiment with the hammer spring for a start ( and avoid degassing and disassembling until necessary) - as you say, on a balanced valve it's effect is usually minimal, but all of a sudden it can be quite substantial depending on tune. Huma reg is nice for fine tuning, but stock reg is excellent. I left mine on factory settings (approx 120 bar). I doubt the depinger itself has reduced the power.
 
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If your gun was truly that great with 25’s going 1,005, I would ditch the depinger. Your gun obviously needs that plenum space. I hope you marked the reg just in case of a return trip. Having a truly spectacular slug gun is a wonderful luxury. If a little weird noise by your ear is the cost, a lot of guys chasing the consistent slug dragon would love to have that problem.

I have 3 U2 sluggers. They make a little more noise in my right ear than most of my other guns. But go ahead and hold your gun like a pistol and shoot it. Amazingly it’s silent. No ping. A true pinger can be heard by the guy on the bench next to you. If you marked your reg and return it to stock and still have a velocity problem, that’s the only way to know if it was the depinger. If you return to stock and things are back to normal, start backing off that hammer spring. If you haven’t touched the spring even after jacking up your reg, that’s some of the problem that was disturbing you in the first place. You are killing your valve unnecessarily.
 
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A lot of the uragan 2 firing cycle noise when your face is on the stock seems to come from the lack of an oring to seal the external valve stem.

Allows a little 'pop' of air to escape into the stock cavity through the valve stem channel on firing and results in that sort of hollow/resonant noise they make, which is inaudible more than few cm away. One less oring to wear out and no real functional compromise, so I've just learned to see it as the guns characters rather than something to fix.
Must say I've noticed no actual ping whatsoever on the U2 regardless of power output.
 
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Vetmx said:
If your gun was truly that great with 25’s going 1,005, I would ditch the depinger. Your gun obviously needs that plenum space. I hope you marked the reg just in case of a return trip. Having a truly spectacular slug gun is a wonderful luxury. If a little weird noise by your ear is the cost, a lot of guys chasing the consistent slug dragon would love to have that problem.

I have 3 U2 sluggers. They make a little more noise in my right ear than most of my other guns. But go ahead and hold your gun like a pistol and shoot it. Amazingly it’s silent. No ping. A true pinger can be heard by the guy on the bench next to you. If you marked your reg and return it to stock and still have a velocity problem, that’s the only way to know if it was the depinger. If you return to stock and things are back to normal, start backing off that hammer spring. If you haven’t touched the spring even after jacking up your reg, that’s some of the problem that was disturbing you in the first place. You are killing your valve unnecessarily.
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Agreed. I have been using noise cancelling earbuds for guns with pings as of recent if it gets to be too much.
 
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I have an on loan Edgun R3 in .22 that I shot a lot this past summer. Set up as a slug gun (Daystate Howlers or NSA .217's) it's freaking awesome. The pinging bugged the crap outa me the 1st hour I used it. Now it's like Pavlovian conditioning. When I hear the ping I know the slug is hitting the aim point! Barely pay attention to it anymore! I know that doesn't help technically but accuracy is EVERYTHING isn't it? As said above, small price to pay for a gun that delivers what we all aim for (pardon the pun).
 
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Vetmx said:
If your gun was truly that great with 25’s going 1,005, I would ditch the depinger. Your gun obviously needs that plenum space. I hope you marked the reg just in case of a return trip. Having a truly spectacular slug gun is a wonderful luxury. If a little weird noise by your ear is the cost, a lot of guys chasing the consistent slug dragon would love to have that problem.

I have 3 U2 sluggers. They make a little more noise in my right ear than most of my other guns. But go ahead and hold your gun like a pistol and shoot it. Amazingly it’s silent. No ping. A true pinger can be heard by the guy on the bench next to you. If you marked your reg and return it to stock and still have a velocity problem, that’s the only way to know if it was the depinger. If you return to stock and things are back to normal, start backing off that hammer spring. If you haven’t touched the spring even after jacking up your reg, that’s some of the problem that was disturbing you in the first place. You are killing your valve unnecessarily.
Click to expand...

Well, I guess you (and others) are right. The ping was not that obnoxious, I'll just revert it to previous point. I took note of everything so it should be easy to do. The acuracy was really impresive (for me), its the first airgun that I shot that is consistent with slugs. Here is an exemple of a group at 90m:

20241017_172014.jpg
 
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Macros said:
A lot of the uragan 2 firing cycle noise when your face is on the stock seems to come from the lack of an oring to seal the external valve stem.

Allows a little 'pop' of air to escape into the stock cavity through the valve stem channel on firing and results in that sort of hollow/resonant noise they make, which is inaudible more than few cm away. One less oring to wear out and no real functional compromise, so I've just learned to see it as the guns characters rather than something to fix.
Must say I've noticed no actual ping whatsoever on the U2 regardless of power output.
Click to expand...

The depinger that I installed is much smaller then the one on this video, but the end result noise-wise is similar (check it at 5:00):

 
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MJMDP said:
The depinger that I installed is much smaller then the one on this video, but the end result noise-wise is similar (check it at 5:00):

Click to expand...
Interesting, I had assumed that the sub12 ping was maybe a consequence of the state of tune needed to get them that low.
It hasn't been present on any of the U2's (all 0.22 700's) I've dealt with at all. No stealth depingers installed from the factory in them either. Heard it plenty in the various vulcans of course.
 
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