FX Impact: first two-three shots are slower

My impact does not exhibit that behavior at all. I can count on the first shot going where I aim. Having said that, I got my gun used.

It seems like the regulator is sluggish and is not passing enough air into the plenum for the first shots, but as it is exercised becomes stable. I would hope this is not a feature of a new gun that will eventually "wear in". I would definitely call AOA on this.

You have a creeping regulator. I just returned my .25 Impact to AOA and this was one of my concerns. My regulator gauge read 150 when new. Now reads 170-175. It really sucks when you can't depend on that first shot. It takes more hammer force to open valve with higher pressure behind it. That is why velocity is lower until regulator pressure comes down to what hammer spring was tuned to.

"RMORRIS"You have a creeping regulator. I just returned my .25 Impact to AOA and this was one of my concerns. My regulator gauge read 150 when new. Now reads 170-175. It really sucks when you can't depend on that first shot. It takes more hammer force to open valve with higher pressure behind it. That is why velocity is lower until regulator pressure comes down to what hammer spring was tuned to.

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Did AoA fix your problem or just refund you?

"vladb"Thank you for your responses folks! That helps.
It definitely looks like a regulator problem. I just looked at guage, fired a pellet, looked again. The pressure read was slightly lower, but by not much. Just 2-3 bars if I estimate it correctly. It also can explain that weird aim point shift after around 500 shots I had several weeks ago at shooting range. I initially thought it was my scope problem, I didn't track(didn't write down) pellets speed that time, however, at some point I had a feeling that I was getting much higher pellet speed readings before that shift happened.

Interesting enough. If a regulator such a problem, does it point to the degraded QA process at FX side? I haven't see a lot of complains from people about FX Impact quality before, except charging port was not easily available. btw, it seems like FX made a cut to make it easier to detach quick disconnect connector.

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There's always a chance that a mass produced mechanical device is going to have a problem. A bad regulator is something AoA should be able to fix quickly for you. I'd give them a call and make use of the warranty.

my knew 22 is dead nut first or last shot. no poi change SEEMS MINE LOST 100FPS NOT HAPPY CALLED AOA WAITING FOR RESPONCE 

an interesting vid on this subject: https://youtu.be/f6yHTuM76kw, but yes, in your case it looks like a creeping reg

There are two issues. When new, ALL regulators creep, with some being much worse than others. After they seat in, they tend to stay at their set point. A few will creep up a little, which effects the first shot or two. I wouldn't call this fact a defect, albeit exasperating. 

The other are the gauges. We'd all like to think they're precision, but they're not, even on the best of airguns. They also have a VERY small hole for the air to enter, which lessens the shock of instant changes in pressure when the airgun is fired. This slows their read out time, which can give you a false sense of the actual pressure. Personally, I have never found any of the small gauges (≈ one inch OD), to be as accurate as a standard air bottle fill gauge. 

My impact did this also. It is frustrating because I would grab it first thing in the morning to bowl over a starling and of course the shot would be low! If you take a shot to sort the reg birds gone. 
I rebuilt the regulator with a new piston and orings and it thought it hadn't worked but as Allen has said they can come right and mine did. 
Its one of the few things that is often reported as a problem but doesn't seem to have a definite fix! 
It may sort its self out with some time. 
Hope it does. 
Michael

on the Impact:

It's all about proper adjustment of the reg pressure and hammer spring

that's one of my test, the 1 st shot has to be within the ES after the gun has been idle for hours and the next morning. 

the only way to achieve this is by having your reg and hammer spring max out till speed no longer increase, the VS adjuster is backout till you hit the shroud and screw back in a tune. in other words you want to be on top of the rainbow or just over the rainbow of the power band.

example: your max speed is 850fps with the 34g and you adjusted the hammer and VS to get 800fps you will always get low 1st and 2nd shot the next morning or within hours.

let's say your speed max out #4 on the power wheel and there is no reason to use #5 and max setting if you do you will be wasting shots. you can fine tuned the wheel to get your max speed on max.

now if you use any hammer wheel setting below 4 you will get low 1st shot. so don't expect the lower power setting to be as accurate as your max speed--not going to happen.

above is true if there is no major reg creep, 5b is kinda normal.

you stated you are shooting at 800fps with 34g, the reg pressure on the photo look like you're going to max out around 840-850 fps with 34g if this is trun you will have a low 1st shot issue. 

on mine i adjust 5-10fps below my max speed of 810fps with 44g on power wheel #4. on the impact .30 shorty. 350CC tank and 15" ST barrel 26" OAL, yes shorter than my .25 ST barrel Edgun Leshiy shooting at 40fpe. 

If you don't want to shoot at that speed lower the reg pressure to max out at 800fps 

If I understand all this right your at the mercy of the reg pressure 

"sniperlabyo"on the Impact:

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Master Ernest Rowe, will you take order to make custom barrel just like this? Love the Impact compactness.

MINE IS 22 CAL FROM FIRST SHOT TO WELL OVER 130 SHOTS SHOOTING 18 GR JSB ITS LIGHTS OUT ST DEV IS 12 ES IS 4 OVER120 SHOTS SHOOTING 870 NEVER WENT ANY FARTHER THAN THAT