FX M4 impact issues

I personally think paying for the tunes is silly, if you don't live nearby. You live in Montana or Florida and you order the gun, you're likely gonna need a vastly different tune than whatever they do in Utah no?
With slugs out of an Impact? Definitely if you’re picky. With pellets? They could probably get it darn close. With a Cricket, Uragan, Taipan, RAW or Vulcan? They could possibly nail down a good slug tune. The biggest issue is testing the longevity of the combo. A good slug tune today with an Impact might not be a good slug tune tomorrow with it. Very overly optimistic hoping a dealer can do that for you in one sitting before shipping. My hunting pellet tune on my one Impact held up across several states and various weather conditions. So I will never pick on an Impact as a pellet gun. It was stellar.
 
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With slugs out of an Impact? Definitely if you’re picky. With pellets? They could probably get it darn close. With a Cricket, Uragan, Taipan, RAW or Vulcan? They could possibly nail down a good slug tune. The biggest issue is testing the longevity of the combo. A good slug tune today with an Impact might not be a good slug tune tomorrow with it. Very overly optimistic hoping a dealer can do that for you in one sitting before shipping. My hunting pellet tune on my one Impact held up across several states and various weather conditions. So I will never pick on an Impact as a pellet gun. It was stellar.
My M4 shoots AEA 34gr like a freaking railgun… Both out of the standard liner and the slug liner and at speeds anywhere between 880 and 925fps so I have it tuned for 915 fps under “typical” conditions, which gives a lot of wiggle room for fluctuations. Slugs? Picky as can be. Awesome with H&N 34gr and NSA 33.6. 34.9 NSA and VK are acceptable. And all only at the speed they like, way smaller window. Every other slug I tried shoots like hot garbage no matter the speed (and I tried many)…
 
With slugs out of an Impact? Definitely if you’re picky. With pellets? They could probably get it darn close. With a Cricket, Uragan, Taipan, RAW or Vulcan? They could possibly nail down a good slug tune. The biggest issue is testing the longevity of the combo. A good slug tune today with an Impact might not be a good slug tune tomorrow with it. Very overly optimistic hoping a dealer can do that for you in one sitting before shipping. My hunting pellet tune on my one Impact held up across several states and various weather conditions. So I will never pick on an Impact as a pellet gun. It was stellar.
Yeah I had those issues for a while, specially during the winter. 70degrees in the morning, then 95 in the afternoon I would constantly have to use strelok plus
 
I kinda want a super compact m3 build!! I've never tore down a impact but it cant be difficult. Just need a really clean work place and no kid's or wife interrupting me for a few hours!!!
It's not bad, just taking the VA end of the rod off is the only pain. If you have a 3d printer it gets way easier
 
I don’t think guys are breaking valve rods. Unless you heard something I didn’t. Several people have posted pictures of the valve rod near the plenum and there’s black grease. Or is it silicone that’s contaminated? The one dude, who only seems to post when he’s drunk, showed a picture of the oring that came in his gun. It was not what came in our M3’s, MKII’s and definitely not the OG. He changed it out and now is in his glory. FX monitors these forums and because of them and guys like Mubhaur, they are aware. Maybe they tried something and made the gun worse.

I have an extra .25 barrel I built and I’m not using. A buddy would like to pick up an Impact so he can score that barrel off me. He’s torn between a M3 used or discounted or a M4. I kinda want him to get a M4 because no matter what he gets, it’s coming here for a complete tear down before it gets shot. I would like to see whats in his or see what’s different from the M3. There’s also a couple other things I’d like to see when I tune it. He already has a M3 but I have to resist pushing him in a direction just to satisfy my own curiosity. Getting another M3 to behave is not as exciting as something a little different.
A new challenge is always appreciated. Doing the same thing isn't exciting to me either 😁.

If the valve rod isnt the issue, im really curious as to the rumor I saw here that ua had more than 1 in with a similar issue. Also I owe the users and fx an apology for spreading a rumor if that is the case and I was running with bad Info. Even if the valve rod broke I wouldnt care, it's a Lego gun and absolutely everything can be replaced, repaired or modified which is the biggest plus to somebody like me and machine shops that do aerospace grade parts are full of their own drama and nonsense thanks to employees passing the buck.

I try not to be condescending or negative at all here but this will be my one moment where i will veer that direction. There's a lot of guys buying fx guns and trying to modify or tune them that don't have the mechanical prowess or mad scientist horsepower to be messing with them. Some have no business doing hpa even. There's a little play on words phrase my circle uses for that type in any hobby. All dollars and no sense.

Nothing wrong with that but there's better out of the box brands to serve those types of buyers that are way less adjustable and don't have 150 orings.

That said, Im here to try and help encourage and spread knowledge and squash forum dogma but im fallable too.
 
A new challenge is always appreciated. Doing the same thing isn't exciting to me either 😁.

If the valve rod isnt the issue, im really curious as to the rumor I saw here that ua had more than 1 in with a similar issue. Also I owe the users and fx an apology for spreading a rumor if that is the case and I was running with bad Info. Even if the valve rod broke I wouldnt care, it's a Lego gun and absolutely everything can be replaced, repaired or modified which is the biggest plus to somebody like me and machine shops that do aerospace grade parts are full of their own drama and nonsense thanks to employees passing the buck.

I try not to be condescending or negative at all here but this will be my one moment where i will veer that direction. There's a lot of guys buying fx guns and trying to modify or tune them that don't have the mechanical prowess or mad scientist horsepower to be messing with them. Some have no business doing hpa even. There's a little play on words phrase my circle uses for that type in any hobby. All dollars and no sense.

Nothing wrong with that but there's better out of the box brands to serve those types of buyers that are way less adjustable and don't have 150 orings.

That said, Im here to try and help encourage and spread knowledge and squash forum dogma but im fallable too.
I will use the word bashing and scrutinizing because I think thin skins get them confused. Years ago guys would bash FX guns. Bashing is guys who don’t own them but dislike them because of what they heard. Probably hundreds of times so it must be true. Then you have bashers because they just don’t have the mechanical aptitude to deal with that gun. Or even if they kinda do, for $2k, they think it’s stupid. And I support that. They are not wrong. But now we have actual qualified owners who aren’t afraid to tell it like it is.

The last two types are the scrutinizers and the in denial guys. I scrutinize every gun I own. I rarely bash. Scrutinizing anything is good because that’s how we fix or improve it. The denial guy I just never have been able to understand my whole life. You know the guy who tells you your Toyota truck is garbage and relentlessly carries the torch for the truck that has him on a first name basis with the service department manager at his local dealer. Or the guy who’s wife or girlfriend treats him like crap but he just won’t remove his rose glasses.

We and others on this forum are alike in the fact that we like to move forward with our guns. I don’t want to be on a forum that is nothing but a stroke fest. I don’t need constant assurance about my purchases. I want to scrutinize them and help each other get the most out of them. That in turn helps the guys who see this stuff make the decision to either buy one or say no way, not for me. If all we did was stroke each other over our wonderful purchases and glazed over every issue, we are not a forum, we are all YouTube reviewers.
 
I will use the word bashing and scrutinizing because I think thin skins get them confused. Years ago guys would bash FX guns. Bashing is guys who don’t own them but dislike them because of what they heard. Probably hundreds of times so it must be true. Then you have bashers because they just don’t have the mechanical aptitude to deal with that gun. Or even if they kinda do, for $2k, they think it’s stupid. And I support that. They are not wrong. But now we have actual qualified owners who aren’t afraid to tell it like it is.

The last two types are the scrutinizers and the in denial guys. I scrutinize every gun I own. I rarely bash. Scrutinizing anything is good because that’s how we fix or improve it. The denial guy I just never have been able to understand my whole life. You know the guy who tells you your Toyota truck is garbage and relentlessly carries the torch for the truck that has him on a first name basis with the service department manager at his local dealer. Or the guy who’s wife or girlfriend treats him like crap but he just won’t remove his rose glasses.

We and others on this forum are alike in the fact that we like to move forward with our guns. I don’t want to be on a forum that is nothing but a stroke fest. I don’t need constant assurance about my purchases. I want to scrutinize them and help each other get the most out of them. That in turn helps the guys who see this stuff make the decision to either buy one or say no way, not for me. If all we did was stroke each other over our wonderful purchases and glazed over every issue, we are not a forum, we are all YouTube reviewers.
Well said. I will scrutinize anything I buy and I don't need to justify it to myself with denial. A stroke fest of fan boy or negativity chatter doesn't help either.

The pricing of these things being more than double a GREAT rimfire I DO understand with all the machining and pressure vessel parts where some may not, which may make me an outlier. Looking at it as a collection of components I see what it likely cost to make each part, deburr, outside processing and assembly plus the export/import fees and margin for sellers. More parts, more seals, more problems but more potential.

Anyways, id like to know what the exact flaw on op's gun was one of these days.
 
Well said. I will scrutinize anything I buy and I don't need to justify it to myself with denial. A stroke fest of fan boy or negativity chatter doesn't help either.

The pricing of these things being more than double a GREAT rimfire I DO understand with all the machining and pressure vessel parts where some may not, which may make me an outlier. Looking at it as a collection of components I see what it likely cost to make each part, deburr, outside processing and assembly plus the export/import fees and margin for sellers. More parts, more seals, more problems but more potential.

Anyways, id like to know what the exact flaw on op's gun was one of these days.
I would place a substantial bet it was the same old same old plenum oring extrusion. I don’t know what the fat black oring in the picture posted was made out of. But the PUR oring that came with our guns is a tough sucker. If they stuck a 70 or 90 in there from the factory, it would be game over rather quickly for that oring. Unless they fix how they finish the inside of the plenum plug, I can’t see any oring being happy in there long term.
 
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My m4 did the same thing as the op's only it took about 10 shots to get velocity with mine . UA replaced the valve rod and valve rod o-rings . Resealed front of plenum . 3 or 4 thousand rounds later still getting spot on first shot consistency .
That's the hope I wanted! I'll tune as needed for my needs.
 
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What ffp scope are you guys running and are you guys on the element range finder train?
No on their range finder. Helix for ffp on airguns but I went arken/dnt zulus lrf version on my impact and it's a game changer. One unit, records, day/night.range finds and ballistics solves. It can be ffp or sfp it can show as dialing or holdover. Shows your attitude and cant as well. The sensor and screen for the eyepiece are nice.
 
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No on their range finder. Helix for ffp on airguns but I went arken/dnt zulus lrf version on my impact and it's a game changer. One unit, records, day/night.range finds and ballistics solves. It can be ffp or sfp it can show as dialing or holdover. Shows your attitude and cant as well. The sensor and screen for the eyepiece are nice.
Ill look at it!
 
So far tech said that the hammer spring had to be changed out to something lighter. Hopefully I'm speaking right. His email said it was causing to big of a bounce. Here is what was said " the .177 cal sometimes you have to remove the hammer weight because it can cause "Hammer Bounce"
I had that happen when I had the thirty caliber spring, am I mk2, the .22 spring worked just fine though, that's weird.
 
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