Here's an update
Albeit a long time coming
I spoke with Shane (sp?) at AOA
He agreed that the issue was most likely that the regulator was set too high.
And also said that even though the rifle was filled with air but not been shot for over a year, damage to the regulator was unlikely.
So, armed with the excellent Daystate Workshop Video I dove in.
I removed the regulator to find that there were no markings for pressure on it
I took measurements as per the video, marked the current setting and opened it up to inspect the bellville washers.
The washers were correctly oriented.
This procedure did not change the current setting.
I then tested it on a Huma regulator tester
To my surprise, it was set at 140B
This is way under the reading & behavior it was exhibiting.
I reset it at 150B on the tester
Once reinstalled I filled the tube and the regulator gauge on the gun matched the test at 150B
It is now shooting consistently at 150B
No more falling off the cliff

Considering that I did nothing other than inspect the regulator's innards it is my opinion that the bellvilles had taken a set over time and the degassing and inspecting freed them up

That's my story and I'm stickin' to it

Edward

cavedweller said:

I’ve experienced great results with the Benjamin 10.5’s

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I have too; though I've only shot them in one rifle so far. They out-shoot 10.3 JSBs in my QB/Gauntlet hybrid.



A five-shot group at 50 yards from stool-and-bipod Hunter position with the Benjis measured less than 1/2" c-t-c-



Again shooting from stool and bipod Hunter position the next night, a ten-shot group in light crosswinds with the Benjis printed .65" c-t-c-



10.3 JSBs group 1/8" wider at 50 than the Benjamins.

I'll add that the 10.5 grain Benjamins are beautifully consistent, and are reported to have about a .040 B.C.

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Very satisfying littering the yard with them. Remember to shoot mom first when the little ones hatch.

Elis5173 may be able to help. I know he has made them and the center sections with a stop for a fellow member.

RedTide said:

Jim Maccari mentored Paul Watts.

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They both learned a lot from one another. We should all be very thankful for their contributions to our sport

scubajeeper said:

Send me a pm with your address, I have O rings I’ll send you.

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I am tech illiterate. I do not see a msg icon. I just joined today

The regulator is set around 150 bar I noticed the Guage dropped pretty quick if it's colder outside and messed up my Fps and accuracy. Is That normal?

This listing has been renewed

Excellent test my friend. I can't wait to see your next video.

You'll likely get many more replies if you repost under the PCP Airguns forum.
This post is in the Traditional Airguns forum. Ya missed it by one!

MIke

So, I've had this compressor for a few years. I've had my fair share of problems with it too. The last major issue was the crank case housing cracked where it bolts to the motor. After re-assembling a new one it wasn't compressing that well and after really looking over the second stage cylinder I could see some wear, so I started looking for a new cylinder. I ended up getting a used, fully complete second stage assembly from AirVenturi that looked better than mine. After tearing it down and cleaning/polishing both reed valves and their mating surfaces I re-assembled it all. At this point it would build pressure to 3300-3500psi but then it would start detonating the oil (I think that's what I'm hearing), creating a short irregular knock and then black discharge to the bottom of the filter tower. This was also on a fresh set of AV high pressure seals (about $35 worth)

Might next thought was to swap lube oils although the one I've been using had been working fine. I ordered some Seco 500 thinking this was going to cure the current issue. Nope, still has that intermittent rattle/knocking at high pressure. Pulled the cylinder off and the high-pressure seals still looked like new. This is where I'm at now, so now I'm thinking maybe it has something to do with the discharge pressure leaving the first stage side going to the suction of the second stage. I'm wondering if the first stage isn't sending enough pressure, which I think is actually acting like a back pressure to keep any oil from migrating easier across the second stage seals that is ending up on top of the high-pressure piston and then doing a little detonating.

A couple of years ago out of curiosity and troubleshooting I actually measured the discharge pressure of the first stage and if I remember correctly it was somewhere around 350-400psi.
I tried this again recently, but I really didn't have the correct gauge, but I could tell it wasn't going to be anywhere near 350psi. But the air flow volume seems pretty good. As soon as I get an in-range gauge I'm going to test it again.

Just wondering if anyone else has ran into this issue and found out the first stage being the issue. I may pull it apart today and check the rings but they looked fine when I replaced the crank case housing. Sounds crazy I know but I'm about at my wits end this time.

At that short range my preference is iron sights, but I hadn't seen a rifle with anything else until I was in my 40's. So iron sights are `comfort mode' for me.

I agree, for short range and quick acquisition, the red dot is the modern way to go.

No matter how many pellets you shoot to these silhouettes, a few paint with a brush and they look perfectly new again.

And at the distance you can perfectly see how were your groups and how close to the vitals.

I am happy with the purchase.

Gerry52 said:

Squirrel & a jigger of Tequila

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Yum

Tested the FAS 609 today. Very consistent around 570 fps with 8.44 grain pellets. A bit hot for a match gun, but it’s a “sporter” now. …
Mounted a red dot. Much more user friendly, and the way I want it to be.

seems to be stacking them in there nicely. definitely a dream gun of mine for sure

This listing has been renewed

This listing has been renewed

Congratulations!



Many thanks to Dead Center & Travis for making this happen.

The course is all set up and ready for you shooters tomorrow morning. 60-shot Rifle match is first followed by sandwiches and drinks for lunch, and then a 60-shot pistol match in the afternoon. We will be using timers to help everyone move along while shooting and also please don’t dilly dally between lanes.

I was just curious if other guys were familiar with them OK.

I was looking at the schematic for the Challenger Pro and some trigger parts look the same as the HP series, at least in how they work. The backside of the trigger lifts the front side of the sear pulling the sear out of engagement with the hammer. So polishing the engagement surfaces of where they meet reduces pull. Trigger and sear spring can be lightened for a reduced pull. Keep the original springs and buy some lighter springs at ACE Hardware.

This listing has been renewed

Not yet. I onl

RFORESTR said:

Nate, just love your vids. Did you get a chance to go to 200 yards with this scope.
Thanks,

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I actually only shoot when I'm filming...so when I do shoot it 200 yards, you guys will know about it within a week. On the Skout, it's about my personal airgun journey. I have only shot it to about 60 yards (as seen on TV). ...so in a few weeks I will bust it out and go for my first 100 yard group (with the short barrel)...I have a barrel that is literally 4 feet long for shooting 200 yards. We will get there! -Nate

I really like that type of scope. It doesn't weigh much, leaves room for loading and enables decent accuracy.





Cheers,

J~