Tuning FX Impact Mk2/M3 - slower first shot - no reg creep - quasi-scientific analysis

[PcpMachinist]

I can tell you that I have installed the 'special' O-Rings in my M2. I STILL must fire at a minimum of 9 shots for the velocity to come up to the setting. This with polishing the rod.
Starting at 813 and growing in increments of around 10-15FPS until reaching 925FPS.
Do the magical O-Rings work for me? Nope!

mike

and your gun has more issues than o rings I'm sure try using dry air .
and learn how to diagnose your gun you will be allot better off.
you will learn some day don't worry it comes in time..
i been into this hobby for 35 years now ,seen allot been to the Fx factory 4 times been to daystate browning Remington etc.
hmm oh NOW ITS MAJICAL O RINGS and YES THEY WORK problem is you have no idea how to diagnose
None of my guns have your problems so maybe you might want to look in other places Majic lol...
this thread is like whipping a dead dog never seen such a site must be nice to know everything.
i see what the others mean by this website is like the view, more covid shots..

 

[thommy]

I've been using the Mubhaur component for a few weeks now. But I can't get rid of that first slow shot after a 12-hour break. I do want to emphasize that the M3 is spot on after that first shot; the velocity is almost clock-steady! Following Mubhaur's advice, I increased the spring tension a bit and closed the valve adjuster a bit more, but after about 1000 shots, this did not solved the problem. I should also mention that I also installed the new valve rod kit along with the Mubhaur pelnum end. Of course, everything was polished up nicely. The first shot after a long break is 16.40 fps (5 m/s) slower. All in all, I'm satisfied, and as a benchrest shooter, it doesn't bother me much. The fact is, the rifle now generates almost clock-steady velocities.

 

[Ries]

im not mad and fact is none of my guns have an issue with this slow shot problem so it sounds to me
like you have not found your issue, its not just the o rings..
have you ever seen what an o ring does under extreme pressure in a conical seat?
you may want to take a look of do some reading up on it..

I know what it does. Look post above, someone said the orings didnt even work in his impact. It looks like you trying to sell the orings, lol.

Since I have a modified plenum neck where the oring sits flush and not conical, my problem is gone. Hmmm..

Believe what you want, lets get back to shooting.

 

[CrashKT]

I've been using the Mubhaur component for a few weeks now. But I can't get rid of that first slow shot after a 12-hour break. I do want to emphasize that the M3 is spot on after that first shot; the velocity is almost clock-steady! Following Mubhaur's advice, I increased the spring tension a bit and closed the valve adjuster a bit more, but after about 1000 shots, this did not solved the problem. I should also mention that I also installed the new valve rod kit along with the Mubhaur pelnum end. Of course, everything was polished up nicely. The first shot after a long break is 16.40 fps (5 m/s) slower. All in all, I'm satisfied, and as a benchrest shooter, it doesn't bother me much. The fact is, the rifle now generates almost clock-steady velocities.

View attachment 595686

View attachment 595687

I mean, if it's in that first to fifth shot, I'm ok with that. Especially if consistency is there too.

 

[Revoman]

PcpMachinist​

Hmmm....I might assume that sending this rifle back to UA and having them 'fix' it and them install the O-Rings that I provided, I am to blame for not knowing my rifle and finding the issue.
Nice argument.
It's NOT me that said, "I know everything!", it's YOU.
Your rants mean zippo to me, other than when I get called out.
BS

mike

 

[mubhaur]

I am sorry to know that but I still understand that you can find the right tune

 

[Revoman]

mubhaur​

Happy to hear from you.
I believe that I currently have the right tune.
My M2 is a .25 Caliber, shooting 25.4gr pellets at + - 925FPS, I am getting up to 142 shots from a 250bar fill using a 580cc bottle.
I am very happy with the accuracy at that speed and getting that many shots from a fill is great.
That is running the fill down to just a shave past my regulator setting of + - 135bar. I normally top off just before that mark but decided to take it down a touch further to see just how many shots before accuracy dropped off (accuracy never did drop off, even after just below reg pressure, but I decided to stop to not harm the valve pin). So, even if I'm getting around 130 shots, that to me is a good tune.
The only issue is that fact that the first 8-9 shots are not up to speed after highly polishing the rod, plus using the (now) recommended O-Rings.
I'm not going to try and better that tune just because of another opinion, it's good in my view..
As always, I thank and respect your viewpoint and contributions to the air gun hobby.

mike

 

[mubhaur]

mubhaur​

Happy to hear from you.
I believe that I currently have the right tune.
My M2 is a .25 Caliber, shooting 25.4gr pellets at + - 925FPS, I am getting up to 142 shots from a 250bar fill using a 580cc bottle.
I am very happy with the accuracy at that speed and getting that many shots from a fill is great.
That is running the fill down to just a shave past my regulator setting of + - 135bar. I normally top off just before that mark but decided to take it down a touch further to see just how many fills before accuracy dropped off (accuracy never did drop off, even after just below reg pressure, but I decided to stop to not harm the valve pin). So, even if I'm getting around 130 shots, that to me is a good tune.
The only issue is that fact that the first 8-9 shots are not up to speed after highly polishing the rod, plus using the (now) recommended O-Rings.
I'm not going to try and better that tune just because of another opinion, it's good in my view..
As always, I thank and respect your viewpoint and contributions to the air gun hobby.

mike

Your issue should be resolved with my after market part as I understand

 

[UDABEGGER]

and your gun has more issues than o rings I'm sure try using dry air .
and learn how to diagnose your gun you will be allot better off.
you will learn some day don't worry it comes in time..
i been into this hobby for 35 years now ,seen allot been to the Fx factory 4 times been to daystate browning Remington etc.
hmm oh NOW ITS MAJICAL O RINGS and YES THEY WORK problem is you have no idea how to diagnose
None of my guns have your problems so maybe you might want to look in other places Majic lol...
this thread is like whipping a dead dog never seen such a site must be nice to know everything.
i see what the others mean by this website is like the view, more covid shots..

What does covid shot have to do with PCP shots ?

 

[CrashKT]

What does covid shot have to do with PCP shots ?

Angry old man with access to the interwebs....

 

[PcpMachinist]

PcpMachinist​

Hmmm....I might assume that sending this rifle back to UA and having them 'fix' it and them install the O-Rings that I provided, I am to blame for not knowing my rifle and finding the issue.
Nice argument.
It's NOT me that said, "I know everything!", it's YOU.
Your rants mean zippo to me, other than when I get called out.
BS


w

far from a know it all but know enough.
i get a kick out of people like you that get involved in a thread that you have no idea how the internals even work.
so as you say YOUR RANTS are useless.
yes Utah air is you best bet to get it fixed right the 1st time great bunch of guys .
maybe you should watch some of ernie rows videos you may learn something..
enjoy your day..

 

[PcpMachinist]

Angry old man with access to the interwebs....

not angry just have an allergy to the b.s. when i read things like copy cat
so if another company or person makes a part in there way to fix an issue its a copy cat, i call that innovation.

i hear all this talk about how an o ring cannot do this and that due to the shape
so my question is how many you actually seen the 2 new plenum o rings that were made by accu shot orings??
the valve rod o ring is not flat its not just an oring made with different compounds its shape plays a big role as well.
problem is not to many do there research, they go off what others say,, like reviews take them with a grain of salt.
those 2 guys one has a high pressure Numatics company that makes very high pressure linear ccc valves
your talking in excess of 8500 psi .
long story short there o ring is not flat and the one that hold that valve rod locks it in place as that also was re done as well.
my advise do the research like this angry old man did..
have fun..

 

[Ries]

You clearly dont know what you are talking about.

Go try and sell your orings somewhere else.

 

[Revoman]

PcpMachinist​

Well, it sounds like you know me better than I know myself.
Have fun ranting here. I'm done with the keyboard warrior who knows everything.

 

[PcpMachinist]

You clearly dont know what you are talking about.

Go try and sell your orings somewhere else.

your correct you have no clue and as far as the o rings go there not mine wish they were its negative people like yourself Karen.

 

[Ries]

your correct you have no clue and as far as the o rings go there not mine wish they were its negative people like yourself Karen.

I tried to help people understand the problem, and the correct fix for it. If FX changed the plenum neck design now, there is a reason.

Im not negative, I never insulted. You are the negative one who insult people here.

 

[PcpMachinist]

PcpMachinist​

Well, it sounds like you know me better than I know myself.
Have fun ranting here. I'm done with the keyboard warrior who knows everything.

yep just another negative person
alot of us have been off and on this website since it was published, problem is we see more negative attitudes
here. bashing people and brands and for what reason ? this site used to be full of information no one bashed
or gave ignorant answers, seems like since covid to many people on edge
i see one guy ask a question about buying an m3 or m4 8 out of 10 answers had nothing to do with what the guy was asking
pencil straw o rings etc etc same old broken record from the keyboard warriors just waiting to bash.

what is funny is not one of you who commented know me from a hole in the wall
or what pcp company i work for which i will leave out.
when all of us get together and go to some of these bench rest competitions we all get along along its a great atmosphere
with 100s of people who really enjoy the sport,, seems some have lost that on this site
to bad..... and pretty sad now i see why some move on from this site....

 

[Ries]

what is funny is not one of you who commented know me from a hole in the wall
or what pcp company i work for which i will leave out.
when all of us get together and go to some of these bench rest competitions we all get along along its a great atmosphere
with 100s of people who really enjoy the sport,, seems some have lost that on this site
to bad..... and pretty sad now i see why some move on from this site....

Stop acting like a big man. We dont care who you are, we care about the community here and helping people.

""this site used to be full of information no one bashed or gave ignorant answers, seems like since covid to many people on edge"

Looks you are insulting and bashing. Its not because we have different opinions, we are negative or on the edge.

 

[Michael]

*Any subsequent insults between @Ries or @PcpMachinist will result in Warnings being issued.

Exercise common sense and be considerate towards your fellow users. The diversity of opinion and intelligent civil discourse is encouraged; by the same token: rude, lewd, vulgar, obscene, flaming, baiting, trolling, hateful, threatening, insulting, violent, or slanderous content will not be tolerated. You may challenge others' points of view and opinions, but do so respectfully and thoughtfully.

 

[Apollo]

PcpMachinist=Accu-Shot orings.
So I wonder whether it is appropriate for him to post in the user section to put his o-rings in a positive light.

A lot of interesting information was shared here about the problem, the custom part from Mubhaur, the official updated part by FX, and the positive experiences people have with it.

It must be said that PcpMachinist/Accu-shot has a very interesting video about pellet or slug seating, but when it comes to selling the plenum o-rings, this video, by someone who knows what he's talking about, shows it in all honesty: