N/A 😳 What's wrong with my gun? — Look at this shot string!

[orion]

Knowing that the gun is not new, that regulator might be compromised.

One thing you can do is just order the kit and re build it. They are selling the kit for $100

REGULATORS

At RTI Arms.shop we distribute the fantastic Slovenian-made RTI Prophet, an extremely accurate platform meant for the shooter who strives for perfection.

www.rtiarms.shop

It's not difficult to do at all. I was thinking the other day to record a video about this same topic.

 

[JungleShooter]

Thanks, Erlis, for the links and tips.



I am slightly confused at the amount of suggestions to "BUY this" and "BUY that"....

Because, I was under the impression that when buying a brand name airgun the manufacturer fixes stuff for free when it brakes.
➧ So, no need to buy Huma this, and Rebuilt kit that.....

➧ Or am I having a fever dream?
(Be patient with me — I'm still recovering from two weeks of "flu" — which a couple of years ago would have landed me in strict Peruvian quarantine, when they termed that flu "corona". )

Matthias

 

[orion]

I'm not sure if the warranty will cover the gun you have because as you said, it's not new and it might be out of warranty.

I'm not saying buy it yet, just giving you the options in case the regulator doesn't get any better.

Maybe the first step is to disassemble it, give it a good clean, put some silicone grease on the orings and assemble again. Maybe the problem is just as simple as having dirt there preventing a good seal. Also reach to the previous owner and ask if this was happening before, hopefully you bought from an honest guy and he will give you information about the rifle.

 

[cmatera]

Welcome to the wonderful world of PCP's

 

[nervoustrig]

With the understanding it is second hand, I would do as Orion suggests and disassemble and clean and inspect the regulator. The most important area is the valve seat...meaning where the piston squeezes against the orifice. If the plastic seal is worn and/or deeply indented, it will not do as good a job holding a stable setpoint as the reservoir pressure declines. The solution is to either replace the plastic seal or wet sand it flat and smooth.

 

[lbc_PSI]

If you purchased used, try looking at the reg internals. The old adj reg internal used a spring, while the newer version uses Belville washers.

Airgunheaven sells the rebuild kit for much less than RTIarms..if you need it.

Aside from the Huma not being externally adjustable. It is easy to set up especially if you fill to only 210bar to tune. Shot to shot fps is very tight, too.

 

[Spinach]

I've had similar problems with my prophet 2, always I think it's the assisted valve again. Often proved wrong.

The regulator is the culprit 90 percent of the time.
I have a proven lane regulator, more reliable than a Rolex . Now whenever I'm head scratching the regulator gets switched.

My latest regulator from RTI is acting up, again .

Proven by the regulator swap and chrono.

Hopefully you get sorted soon.

 

[Motorhead]

As stated by many over and over again .... there is not enough gain in shot count filling above 250 bar weighed against the wear & tear on the systems o-rings & seals to make it worth while.

Yes SERVICE the reg ... don't fill above 250 bar. HST in balanced valved guns generally does little & best run soft as you can go & still open the poppet.
Velocity is controlled with Pressure adjusted at regulator ... NOT the HST setting

 

[weevil]

There are no free lunches. The dangers of buying used include the previous owner and lack of warranty. Based on what other owners are saying, I would get the Huma and be done. Not having an externally adjustable reg is a good medicine against excessive tweaking!

 

[JungleShooter]

Thank you all, great help!

I haven't gotten to the shot string yet.

After that I'll check the reg.

And the only reason I bought an RTI and not another of the East European brands is the externally adjustable regulator!
(And NO: I'm not buying an FX until their barrel assys are made for rough hunting environments and 4-wheel single track traveling, and not just for high profile, customer-attracting competition environments.... )


The 50 bar of air, from 250 to 300bar — gives me 10 extra shots. To have a shotcount of 30 vs. 40 seems to be rather significant loss....


Matthias

 

[L.Leon]

Thank you all, great help!

I haven't gotten to the shot string yet.

After that I'll check the reg.

And the only reason I bought an RTI and not another of the East European brands is the externally adjustable regulator!
(And NO: I'm not buying an FX until their barrel assys are made for rough hunting environments and 4-wheel single track traveling, and not just for high profile, customer-attracting competition environments.... )


The 50 bar of air, from 250 to 300bar — gives me 10 extra shots. To have a shotcount of 30 vs. 40 seems to be rather significant loss....


Matthias

Stressing your gun at 300 BAR is simply not worth it as others have already pointed out. If you’re hell bent on extra or “more shots” get a bigger bottle and fill that to 250 BAR. More shots and less stress on all the involved parts… Or get a .22 barrel for your RTI and get more shots that way… Lots of options, limited only by your budget.

 

[Vetmx]

I know you’re not happy with the modern way of fixing things by throwing money at it so I will tell you how I fixed the RTI adjustable reg that I bought to replace the Huma that wasn’t doing a good job on my Priest. I plan to do it to my P2 once I figure out what components and caliber I’m sticking with. When their latest version arrived, I knew there were still issues with it along with topics of guys trying to work their magic with it. They had tunnel vision and were looking at the usual culprits, doing a nice job with making things all shiny and smooth. I took it apart, saw how it worked and diagnosed a problem. The runout on the pin is horrible. So I got it within a thousandth and that reg was solid. So solid that it’s in a drawer in my gun room. When I sold my Priest, I tuned up the Huma and got it behaving nicely from 250b down to 135b with some careful hammer adjustments. Unfortunately throwing money at issues like this is the only logical thing to do if guys don’t know how or have the means to actually fix something. Maybe if you bought 10 of these regs, a couple might have everything in specs and be solid. If you do get your reg humming along nicely or another reg that works, don’t poke it with that 300b stick. You don’t want to speed up the timer on the premature end of your happiness.

 

[JungleShooter]

Another shot string as promised.

➠ Result: The same as before (I think).
For the second part of the string I dialed the HST further IN.


● In the beginning, same REG and HST as before.
● Pellet: .25cal H&N Baracuda Hunter Extreme | 28.24gr

——with AIR from before:
940fps vs. 910 at the end
944
936
REFILL
——AIR 245b | REG 142bar
934
929
935
927
——AIR 222 | REG 138
928
926
924
927
925
——AIR 204 | REG 135
<HST: Turned 1/2 turn IN>
926
923
924
918
918
——AIR 188 | REG 135
916
915
913
908
910 versus 940 in the beg.
——AIR 170 | REG 132





REG disassembly

I degassed the bottle.
Then, I pulled the trigger, just in case to sure there was no more air in the gun....
And my father in law almost fell off the toilet seat when the loud shot rang out (I had the silencer already removed).
No instructions in the manual for degassing — I finally figured it must be the 4mm allen screw in the rifle butt.... Done. No more toilet accidents.

➠ The reg and o-rings seemed to look fine to the untrained eye of greenhorn (mine!). Cf. pic.

➠ The lubricant seemed (to this a neophyte at least) to be some light-weight oil, certainly not silicon grease.

 

[JungleShooter]

If you do get your reg humming along nicely or another reg that works, don’t poke it with that 300b stick. You don’t want to speed up the timer on the premature end of your happiness.

More literary gems buried in airgun forums' most obscure threads. — Now I'm really enjoying my evening on the forums! (Thanks, Frank.)



I HEAR you all loud and clear: "Matthias, don't use 300 bars!!"
And I DON'T LIKE WHAT I HEAR!!
You HEAR me?!?

➠ For the record, under great protest I grudgingly will follow your advice.
Only, ONLY, because I have come to trust you.


Thanks,
Matthias

 

[L.Leon]

More literary gems buried in airgun forums' most obscure threads. — Now I'm really enjoying my evening on the forums! (Thanks, Frank.)



I HEAR you all loud and clear: "Matthias, don't use 300 bars!!"
And I DON'T LIKE WHAT I HEAR!!
You HEAR me?!?

➠ For the record, under great protest I grudgingly will follow your advice.
Only, ONLY, because I have come to trust you.


Thanks,
Matthias

Many other “trusted” members, @Motorhead, a well known air gun tuner; being but one example, advised against filling to 300 BAR. Why would you want to put that kind of strain on your HPA supply side (compressor) or gun? Did you bother to read how many posted advising you not to fill to 300 BAR, mine included. You simply chose to ignore advice given many times prior. But am glad you are on your way to fixing your problem.

 

[orion]

Check the red plastic seal, check if it has marks or if it's flat

 

[Motorhead]

Hmmm I think the washers are not set correctly
They should be grouped two out then two in

View attachment 422301

I had noticed it too .... but not worth nit-picking over.
His still is opposing PAIRS, but has it Convex / Convex at the ends .. where it is best having Concave/ Concave on the ends as shown by ORION's picture.

 

[orion]

I had noticed it too .... but not worth nit-picking over.
His still is opposing PAIRS, but has it Convex / Convex at the ends .. where it is best having Concave/ Concave on the ends as shown by ORION's picture.

I ended up removing the picture and changing my comment because I thought it could be a distraction.

I think the mos important thing will be give it a good clean, clean the inside where the washer seal very good, lube the orings and assemble again and it might solve the issue. Monty has a video showing this on YT he explains that the regulator was received with the complain that it was not regulating at all, and he just give it a good clean and problem solved.

 

[Vetmx]

This is a little off topic but something I found interesting. And it could also go full circle. It’s about us trying to make tiny guns do what little guns do. Or little guns do what big guns do. My 600mm P2 .25 matches your speed numbers or at least is close enough with my reg set at 108-112b. So now let’s look at my useable shots from 250b down to 115b or so and how my gun sounds and behaves. Sometimes just because our tiny gun will do something doesn’t mean it’s happy doing it. All barrel lengths sitting on whatever platform have a wheelhouse where they operate best and all the numbers look good. Speed, ES and shot count. Might be time to experiment with some lower pellet speeds and friendlier reg settings. A little can go a long way. Sometimes if you want big power and good numbers, you just have to buy the appropriate size gun.

 

[orion]

This is a little off topic but something I found interesting. And it could also go full circle. It’s about us trying to make tiny guns do what little guns do. Or little guns do what big guns do. My 600mm P2 .25 matches your speed numbers or at least is close enough with my reg set at 108-112b. So now let’s look at my useable shots from 250b down to 115b or so and how my gun sounds and behaves. Sometimes just because our tiny gun will do something doesn’t mean it’s happy doing it. All barrel lengths sitting on whatever platform have a wheelhouse where they operate best and all the numbers look good. Speed, ES and shot count. Might be time to experiment with some lower pellet speeds and friendlier reg settings. A little can go a long way. Sometimes if you want big power and good numbers, you just have to buy the appropriate size gun.

This is good point, my .22 compact is shooting the Hades at 880fps

I think this is the reason the shot count is low and this drives the need of running the bottle pressure at 300. I think this circles back to the conversation we had few weeks ago, tune for accuracy.