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Umarex  Notos leaking through the barrel.

All I could get out of them was send the gun in. There smith would determine what was wrong with it. Also they won't sell parts. One of their techs last week said it was a three year warranty. I was suspicious of that comment. I thought it was for a year only. I talked to them again this morning. The story changed somewhat. The three year warranty is only good if their smith determines it's a safety issue. The tech I talked to...couldn't tell me what that was...soooo he said "send it in".

I tried cocking the rifle...it doesn't leak through the barrel anymore...now it's leaking right at where the air tube screws into the block on the action. Don't know if that is the regulator or maybe the poppet value?? I've taken both apart, and both look okay (whatever that means...lol!). Back to the drawing board!
I don't own a pcp umarex, just a cheesy break barrel pistol. I'd just find a oring kit or list and rebuild the entire gun, it's not that scary. I do fx guns in about 30 minutes, all 7k orings.

The Real Science of Airgun Suppressor Selection

Hey there airheads!

The other day we sent out an email talking about all the years of experience we’ve had working with airgunners around the world—chasing down the best sound suppression possible in the airgun game. We got some great responses back, and thought, why not bring the conversation here to Airgun Nation and keep it going?

One of the big topics that came up was how air volume and internal design, whether it’s a monocore or traditional baffle stack, actually affect the shot report. Sure, there are computer models that can predict airflow and potential decibel reduction, but the reality is airguns behave very differently than firearms. They have their own quirks in how large volumes of air get expelled and how we tame that sound. Even though DonnyFL and airgun suppressors in general have been around for a while now, the science of airgun silence is still very much evolving.

When Donny first started this company, it was a lot of good old-fashioned trial and error. Just the other day, Yolanda was reminiscing about those early days, how she and Donny would stand out in the field doing A/B tests, swapping moderators back and forth, and listening closely to the differences in tone and volume. No meters. No fancy charts. Just honest, real-world feedback about what our ears told us worked best.

Over time, we’ve added sound meters and other R&D tools to the process, but we’ve learned something important: feedback from real shooters still matters more than any number on a screen. A meter might tell you it’s “quieter,” but your ears can reveal something completely different, especially downrange.

So how do you choose the right suppressor? It’s not as simple as picking the “quietest” one on the list. Caliber and power tuning matter, a hot-rodded .22 PCP can be just as loud, or louder, than a .22LR rimfire. Barrel system design plays a role too. Shorter barrels often have a sharper, louder report, while longer barrels can be sensitive to weight on the muzzle and may not play nicely with a heavy suppressor.

Then there’s how you actually use your rifle. In competition, suppression might not be the top priority, you might be more focused on how a suppressor can influence barrel harmonics. On the other hand, if you’re pesting in your backyard or working in a sound-sensitive area, maximum suppression becomes a must-have.

The quick and dirty rule is that more internal volume usually means better airgun suppression. But that’s oversimplifying it. Tone matters just as much, and in some cases, going with a really long moderator may hurt the balance or handling of your rifle.
We’re working on a comprehensive air rifle suppressor selection guide to help make those decisions easier. In the meantime, we want to hear from you. The best part about the DonnyFL community has always been the feedback we get from real shooters. We started out as a grassroots company right here in the online forums, and that community-first approach will always be part of who we are.

So, how do you judge airgun suppressor effectiveness? Is it tone, volume, group size, or a mix of everything? Got a favorite testing method you trust? Let’s make this thread a go-to resource for anyone looking to get the most out of their airgun sound suppression. Also, check out our full lineup of airgun moderators and air rifle suppressors!

DonnyFL Moderators

Umarex  Notos leaking through the barrel.

Thanks to everyone.

I can now take this Notos apart and put it back to gather just about blindfolded...lol!

I did order a poppet valve from Mable and got a couple of sets of barrel o-rings coming. Pretty cheap stuff in the "scheme of things". I pulled the air tube apart again and adjusted the regulator back and worth (lubed o-rings again) and pressured it up. It held 2800psi pressure for about an hour "until" I dry fired it. Air went out of the muzzle end of the barrel again.

I'm gonna wait until the poppet valve and the barrel o-rings get here before trying anything else. I may be into one of the Huben Power Dream Regulators. I was hoping not for a couple of reasons...namely I didn't want to spend the cost of that regulator and a bottle for it (might as well buy a new Notos), and I do like the factory tube and number of shots for what I do with the Notos. I have a FX for the other stuff. I've had it seven years and shot thousands of Sage Rats with it and no problems to date.

Thanks again.
Thats a legitimate poppet issue. Or valve housing oring
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Can anyone tell me the best way to sell a PCP Airgun

I'm in Atlanta. We just bought a new house and I don't have access to as much outdoor space as I used to. Originally I bought my pcp to handle a squirrel issue that I had in my attic. Let me tell ya, my daystate was more than capable. What other youtubers do you watch for airgunning?
100 percent Peppermint oil on cotton balls will keep mice and Squirrels out . pure peppermint oil NOT the stuff in the food / baking isle just Google it .

Umarex  Notos leaking through the barrel.

Thanks to everyone.

I can now take this Notos apart and put it back to gather just about blindfolded...lol!

I did order a poppet valve from Mable and got a couple of sets of barrel o-rings coming. Pretty cheap stuff in the "scheme of things". I pulled the air tube apart again and adjusted the regulator back and worth (lubed o-rings again) and pressured it up. It held 2800psi pressure for about an hour "until" I dry fired it. Air went out of the muzzle end of the barrel again.

I'm gonna wait until the poppet valve and the barrel o-rings get here before trying anything else. I may be into one of the Huben Power Dream Regulators. I was hoping not for a couple of reasons...namely I didn't want to spend the cost of that regulator and a bottle for it (might as well buy a new Notos), and I do like the factory tube and number of shots for what I do with the Notos. I have a FX for the other stuff. I've had it seven years and shot thousands of Sage Rats with it and no problems to date.

Thanks again.

Pure Lead: The Unspoken Advantage in Airgun Slugs

NSA Sold? When & to whom?
yes I am curious as well..I bought a box of 22@217 of H&N 40 grain slugs and same thing with Zan.. back in October.. I shot a lot of them in my Condor's..Condor and Condor SS and I really couldn't tell any difference between them but the H & N I think was slightly better.. I think Zan is package a bit better for shipping but I honestly like the screw on tins.. and slugs get a lot less damage than pellets in shipping.
Mark
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Umarex  Notos leaking through the barrel.

It appears that even after you replace the oring to stop the leak you will still need to cock the gun before filling it to get it to take a charge. This may not be the case after the initial fill as long as there is enough pressure in the valve to overcome the hammer spring.

Two Avenge-X rifles, five months, and a part-time job I’m paying for...

After doing a ton of research and watching numerous videos I was excited to get a .22 caliber Avenge-X to compare to the other PCPs in the cabinet.

Unfortunately a problem with the regulator made it unadjustable and the rifle could not be tuned down to shoot anything less than 25 grain pellets. I returned it for full refund.
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Other  Break Barrel VS. Underlever

Makes perfect sense, and my only side lever (an FWB300) is an incredibly accurate gun. I don't compete, but have noticed that in all piston FT competitions virtually all shooters have TX200s or hw97ks. That is not a coincidence.
R
That makes sense. I think FT involves greater ranges than than what those ten meter guns were designed for and need more power. Ranges in FT run from 10 to 55 yards, that would be stretchng the effective range of my FWB 150 or 300.

Umarex  Notos leaking through the barrel.

If the slow leak is the poppet that can be determined by putting a balloon over the end of the barrel. If the poppet is letting air by it will go out the barrel like before. It was leaking there before so it may be the cause ? If it’s leaking where the air tube goes into the action/block that isn’t the poppet and will just be a simple oring.
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Two Avenge-X rifles, five months, and a part-time job I’m paying for...

Surprised you can't get a schematic from the manufacturer. I mean even AEA sent me one after not getting one from the supplier.
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Vevor water cooled, looks like a GX CS4 clone...

Question for the moderators: Is there a role for an archive to show the differences between the various compressors?

It might make it easier for those trying to decide on purchase.
It would have to be consistently updated. Even the cs4 posted here is an old model and not like the current production. I'm sure other compressors will change as well as time goes by.
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N/A  What did you name your airgun

Did not know that. They sure seemed better to me , and looked better too.
It's an on-going issue on many mechanical groups. Many will not accept it until an aircraft tech weighs in to point out that it's illegal to use stainless on aircraft aluminum.

Many scope mounts and rings are alumimum/alloy so a good anti-seize should protect you. I wouldn't use torque values for Grade 5 (US) or higher or metric Property class 4.8.

When I was in the mechanical trades, we hated stainless because they are weaker and softer than steel, and if heated they can turn harder than glass.

If one needs to drill stainless, use lots of lube and turn the bit slowly to avoid spot heating and hardening.

Carbide bits often don't like stainless because it's soft and the bits can dig in and break.

Many vehicle manufacturers like to use stainless as exhaust manifold bolts and studs. Talk to a Cummins Diesel truck tech. When they discovered carbide bits, like Garr, their world changed as the broken studs were incredibly difficult to drill out. Ford too.

Another potential issue for stainless is that the metalurgy is often unspecified so one often doesn't know what one is buying, unless buying a known brand like Papcom Docap, Bowman, etc.

If you are interested, PM and I can send some information that we used to provide to college mechanical trades students.

Have you found that “ One Airgun”?

Unlikely anyone will find one rifle for all purposes. I shoot indoor 10m in my garage with FWB 300s, FWB 602, FWB 700, and Benjamin 400. All are wicked accurate and great to shoot, but I use the FWB 700 the most because I can shoot more and longer; cocking the others wears me out fairly quickly (I am an old duffer). I have other springers and PCPs for benchrest, field target, and generally plinking. Although I really enjoy the Wolverine, I would have to choose the Red Wolf for all uses other than ISSF indoor work.

Mike


Yep yep.

Oh sure, I've found the one.

The one for AAFTA pistol? 1720t

The one for indoor shooting during long and cold winter nights? FWB300

The one for kicking butt in AAFTA field target? USFT .177

The one for high power/long range field target? Taipan Veteran .22

The one for shooting cast bullets to use up all the lead I collect from my pellet traps? Air Force Condor SS .25

The one for prairie dog eradication out to 200+ yards? BRK Ghost .20 (slugs)

The compact one for ease of use and clandestine pesting and general all-rounder? Taipan Veteran .20 (pellets)

Yep, one. One for each use.
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