FX Maverick compact .22 question

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Patrick1

Patrick1

Member
Jan 4, 2021
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Germantown, Tennessee, United States
I was the range practicing and, all of a sudden the shots started going right and down about 1 inch. Pellet speeds dropped from about 880’a to 845-860-ish. No real pattern cuz sometimes it would jump back to 885-890.
I was shooting within 1/8 inch at 25 yards prior to the issue. Has never done this.
Shooting 15.9 FX pellets and I haven’t heard anything unusual.

Any ideas on what would cause this?
Puzzled!
Help please?
 
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Hmmmmm, I've got one of them Mav Compact, somewhat modified and or screwed with. So let's go with the simple stuff first. I your #2 reg staying steady? Digital is the only way to check this,. Is anything loose in your Hammer Spring Adjuster? That pesky screw can work loose. Is everything snug? Have you done something dumb and fired the gun a bunch of times with the cocker back, have to ask, it's part of the list., Have you lubricated the hammer/spring assembly? Is your barrel/transfer port assembly 'snug'? A 1" drop at 25 yards is a serious loss of pressure, that's telling me the Hammer assembly is possibly sticking, I'd squirt a touch of TriFlow in there. And after all that, I'd almost bet your breech o-ring has bitten the dust. Sorry for the long way around but....been there, done it.
 
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Mine started shooting weird low velocity shots and I found the problem to be probe alignment. If you take off your cheek piece and look down the hole in the receiver to the pellet probe, that screw that holds the probe in should be a little forward of center in the hole. When mine started acting up that screw was right in the middle. I readjusted it and it shot great again. Problem is the screws that hold the cocking handle/mechanism to the cocking rod are very small and can allow that cocking rod to slip a little and come out of proper adjustment.
 
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When I adjusted the probe I had also removed the barrel to see if anything was obstructing the transfer port or not. When mine would shoot a low velocity shot it sounded like an airflow restriction. Nothing was in the TP but afterwards I thought it could have been possible that the barrel retention screw loosened and the barrel assembly moved ever so slightly causing the TP to not properly align. Seems one of those two things got it shooting normally though.
 
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Trucker3573 said:
Mine started shooting weird low velocity shots and I found the problem to be probe alignment. If you take off your cheek piece and look down the hole in the receiver to the pellet probe, that screw that holds the probe in should be a little forward of center in the hole. When mine started acting up that screw was right in the middle. I readjusted it and it shot great again. Problem is the screws that hold the cocking handle/mechanism to the cocking rod are very small and can allow that cocking rod to slip a little and come out of proper adjustment.
Click to expand...
I completely forgot about that one, thanks. One other thing I do is a "touch" of Mobil One on the pellet probe to reduce wear on the Transfer Port O-ring.
 
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Yeah, I lube my pellets and, just last week I put a little silicone oil on the probe. I agree that pellet slowing 25-40 fps and a shift to the right and low by an inch indicates air isn’t getting to the pellet, not sure about the pellet move to the lower right is caused by pressure drop but…..
I’ve put loctite on the screws hold the cocking handle to the cocking rod. Gonna check everything now!!
Thanks again for the thoughts!
 
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Hey folks! For sure, the timing was off as the probe was too far back in the hole(it was slightly back from the middle of the hole!). That means the the screws on the cocking handle rod fastener had loosened even with the Loctite!
I have adjusted the probe to the forward position( saw an Utah Airguns YT video). Easy enuf to do. Just need a 2mm and 2.5 mm Allen key.
Will check on the speeds and accuracy asap. I’ll be back with an update afterwards.

Thanks again for all the help!!!
 
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So, the above fix didn’t work so I spoke with Utah Airgun’s tech folks(very helpful!) and they said it was highly likely the hammer being scored by the sear. It is apparently an ongoing issue with some FX guns, especially Mavericks and Wildcats!! The metal of the sear is harder than the metal of the hammer, so the hammer gets worn in one spot.
This causes uneven hammer hits on the valve—-And cause the exact issues I experienced sudden lower speed changes and off center shots.
Anyway they are sending a new hammer and a breach oring. This happened before to me and was fixed by the, now defunct Wilmington FX facility under warranty after I had the gun for about a year.
I’ll letcha know what happens after I make the changes.
 
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I've only had a few issues with mine, shoots really well for the most part(most always sub-MOA, if not it's the shooter, not the gun!). But occasionally something weird will happen like this and I come to this board for help and ideas. I looked at the hammer this morning and tried to polish out the roughness and scoring in the old hammer. Hitting the range tomorrow and will update.
My YouTube search also revealed an English company that makes a replacement hammer for the Maverick/Wildcat that is "polished and harder" than the OEM. Not sure if I'll go that route yet(it is also slightly heavier, too).
 
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I polished the old hammer to try and get rid of the hammer “nicks”(lots of them where the sear touches the hammer!!) and to get better groups and more consistent speeds. Shot a 209 in 30 yard challenge, so accuracy seems better. BUT, 2nd stage on trigger seems “gone” now and the spread on speed is about 40 fps(not good!).
Utah Airguns sent new hammer (warranty) and a breech oring which I’ll install today!
Hopefully this will help the spread and trigger issues.
Will keep you all informed as the journey progresses……
 
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Patrick1 said:
I polished the old hammer to try and get rid of the hammer “nicks”(lots of them where the sear touches the hammer!!) and to get better groups and more consistent speeds. Shot a 209 in 30 yard challenge, so accuracy seems better. BUT, 2nd stage on trigger seems “gone” now and the spread on speed is about 40 fps(not good!).
Utah Airguns sent new hammer (warranty) and a breech oring which I’ll install today!
Hopefully this will help the spread and trigger issues.
Will keep you all informed as the journey progresses……
Click to expand...
I guess there will be some trigger adjustments needed. 209 isn’t possible on the target. You don’t count the two lowest scores.
 
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On the trigger, I adjusted only what the manual said was the pull weight screw(2nd from muzzle). I made it lighter out of the box(2.25 lbs)but I would loose the 2nd stage every 50-60 shots, I had to turn that screw clockwise 1/8” to get 2nd stage back. The 3rd time I turned it 1/4” cw and it has been good for the last 100 shots. I probably should have waited to adjust it until it was broken in.

Maybe yours is wearing in and you just need to give it 1/8-1/4 turn. Mine would change weight when I put the chassis back on, so I would adjust, put chassis back on and then check pull weight. The The trigger screws have loctite on them also.
 
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