FX Fx impact m4, why did they got rid of 1st reg?
- Thread starter Airmanator
- Start date
My thoughts are some people have a better grasp on Ballistics' and tuning their guns and could probably tune most quality airguns to shoot and win competitions, I would use Matt Dubber as an example. I believe the reason he uses FX platforms is because of the ease of tuning them. FX has been the leader of most innovations and is followed by many other top brands.
Upvote 0
The real gas charted is SCUBA quality air.
Notice that in the beginning you get more volume of air per bar than if it were an ideal gas until you reach the transition point between 230 and 250 bar where it takes a greater increase in pressure for the same volume gain.
The drawing is a compression curve from a dive shop manual.
Buy 700 bar (not shown) the real gas curve reaches a slope of 82° and the volume gained per increase in bar is nearly zero.
During decompression from 300 bar, you get a large drop in pressure for a very small amount of volume used.
Upvote 0
Very interesting. Thanks for posting this. It’s nice to learn something and would definitely explain some things I noticed with my Leshiy classic that I do occasionally fill to 300b.
Upvote 0
Yes mostly pellets and sometime NSA 23gr, my barrel prefer 2175 over 217 and 2165 at this weight, reg at 100 bar and Macro at 16 for this NSA slug to fly at 920fps, Valve at 4. For pellets, the Macro between 3 to 8..
I'm not obsessed with chasing after numbers, not a measurebator so I'm not the type to keep messing with the tuning or fixated on specific number, I don't really give a rat arse about the ES and DS as long as the shot connect and landed exactly where i wanted it to. The gun is dialed in now, i don't even waste my time to check for fps after i found out what pellet and slug fly best at what speed and at which distance, unless there's flyers or something is off or doesn't feel right.
I tuned my M4 for maximum efficiency with the lowest noise floor, the current tune is covering a wide range of pellets from 14gr all the way up to slugs in 23gr, at the same 100 bar reg and valve at 4, the Macro/Micro wheel is flexible enough to cover the pellet and slug weight range that i'm shooting at, i'm getting 280~290 shots of pellets per refill from 250 bar down to 100 from the 480cc stock bottle, before it drop off of the reg. The gun feels balanced, operating smoothly, very quiet action, and efficiently...it doesn't feel any stress or being taxed, it's cruising at a very comfortable speed with plenty of untapped power on the table, POI is on point each and every single day I'm shooting it, so there's not a whole lot that i need to worry about other than picking it up and just have fun shooting it, and that's exactly what I'm getting out of this M4 so far....it's fun, and it's predictable.
Unless there's a need for me to drive much heavier slugs on target at much longer distance, otherwise the tune will stay exactly where it is now, or until something goes off track. i shoot mostly within 50 yard anyway, the standard barrel isn't picky on pellets so i could pretty much flip a coin and load whatever, or sling some NSA 23gr for no particular reason other than just for the hell of it.
Until something break or need maintenance, o'ring leak or whatever, then i'll take it apart and replace whatever is needed. Until then, i'll continue to enjoy the hell out of it as you said, to get my money worth..... for however long it may last.
Last edited:
Upvote 0
Aaah, you’re a 50 yard guy. All the negative things guys say that seem to perplex you generally occur once you start stretching the gun out. Maybe there is a threshold where in order to deliver tight groups at extended distances, the gun gets finicky even at 50 or less. In your situation I wholeheartedly support your happiness claims. But I think the majority of Impact owners bought them to go long. That’s why you see a crazy amount of topics that are leaning negative, frustrated or mad.Yes mostly pellets and sometime NSA 23gr, my barrel prefer 2175 over 217 and 2165 at this weight, reg at 100 bar and Macro at 16 for this NSA slug to fly at 920fps, Valve at 4. For pellets, the Macro between 3 to 8..
I'm not obsessed with chasing after numbers, not a measurebator so I'm not the type to keep messing with the tuning or fixated on specific number, I don't really give a rat arse about the ES and DS as long as the shot connect and landed exactly where i wanted it to. The gun is dialed in, i don't even waste my time to check for fps after i found out what pellet and slug fly best at what speed and at which distance, unless there's flyers or something is off or doesn't feel right.
I tuned my M4 for maximum efficiency with the lowest noise floor, the current tune is covering a wide range of pellets from 14gr all the way up to slugs in 23gr, at the same 100 bar reg and valve at 4, the Macro/Micro wheel is flexible enough to cover the pellet and slug weight range that i'm shooting at, i'm getting 280~290 shots of pellets per refill from 250 bar down to 100 from the 480cc stock bottle, before it drop off of the reg. The gun feels balanced, operating smoothly, very quiet action, and efficiently...it doesn't feel any stress or being taxed, it's cruising at a very comfortable speed with plenty of untapped power on the table, POI is on point each and every single day I'm shooting it, so there's not a whole lot that i need to worry about other than picking it up and just have fun shooting it, and that's exactly what I'm getting out of this M4 so far....it's fun, and it's predictable.
Unless there's a need for me to drive much heavier slugs on target at much longer distance, otherwise the tune will stay exactly where it is now, or until something goes off track. i shoot mostly within 50 yard anyway, the standard barrel isn't picky on pellets so i could pretty much flip a coin and load whatever, or sling some NSA 23gr for no particular reason other than just for the hell of it.
Until something break or need maintenance, o'ring leak or whatever, i'll continue to enjoy the hell out of it as you said, to get my money worth..... for however long it may last.
Upvote 0
For 100 yard and beyond, the slugs dominate. Haven't seen any breakthrough in pellet design to perform reliably and consistently at those long distance. I could expect the group to open up a lot wider even with slugs, it will be a lot more unpredictable, more sensitive to the element, and requires far more fine tuning and adjustments, and surely resulting in a hell lot more frustration for most people, and those challenges aren't going to be unique to impact alone. I'm going to have to take mine out to stretch its leg to 100+ yard, to see how it performs beyond the "comfort zone".
Upvote 0
There is a relationship between barrel twist rate, pellet MASS, pellet velocity, and the pellet's stability factor. Most people cannot tune an Impact because they are trying to throw the wrong weight pellet at the wrong velocity down a tube with the wrong twist rate for that weight of pellet and velocity which in turn produces a lousy stability factor for the pellet.For 100 yard and beyond, the slugs dominate. Haven't seen any breakthrough in pellet design to perform reliably and consistently at those long distance. I could expect the group to open up a lot wider even with slugs, it will be a lot more unpredictable, more sensitive to the element, and requires far more fine tuning and adjustments, and surely resulting in a hell lot more frustration for most people, and those challenges aren't going to be unique to impact alone. I'm going to have to take mine out to stretch its leg to 100+ yard, to see how it performs beyond the "comfort zone".
As such, in their hands, the Impact sucks.
Upvote 0
Just found another way to double the shooting capacity without having to tether, with twice the bottle capacity you could even refill them to only 200 bar instead of 250 to reduce stress on the reg. but the setup looks so weird. LOL
Last edited:
Upvote 0
For some reason i was having the impression that most (if not all) impact owners would have a habit or standard practice to test all their new pellets at various speed, be it at 830, 850, 890, or 920 fps, etc. to find the optimal velocity that would work with their barrel, and at the range they're targeting, it's part of the tuning process....
The shape of the pellet is also a factor that will affect flight stability, even at the same weight, you simply can't use the same velocity from JSB 18gr to drive the Crow Magnum 18gr, they are in the same weight class but the Crow Magnum shape like an astray, grouping is all over the place trying to fly them above 900fps, usually they group much better in the low 800s, certain barrels like my Avenge-X simply do not like the crow magnum at all, regardless of the speed, okay at short range but absolutely terrible beyond 30 yard.
Those same people would run into the exact same problem and frustrating experience in any other PCP if they don't take the time to run the test and tune it properly....
Last edited:
Upvote 0
That's like asking how long it takes to get to Cheboygan without mentioning a starting point.
Upvote 0
Was hunting this morning and my first opportunity was a crow. I ranged it at 139 yards. This gun hasn’t been shot in at least a week. Dialed my scope and placed one in the center of its chest with a .30 slug. This topic came to mind. Try placing your first slug out of your Impact into a 1.5” zone at over 100 yards after your gun sits for a week. I can probably save you the trouble because in all likelihood, your beloved Impact won’t do it. After you get it warmed up, then maybe it will do it more times than not. Good hunting gun vs great hunting gun.
Upvote 0
Then prove me wrong. Let your Impact sit a couple days and cold shot that sucker at a target. Do 100 yards. You can cheat 40 yards. You don’t even have to post how it does. Or maybe you already know.
I perfectly understand when guys love their Impacts. I do too. I have three of them. But you asked about guns that are basically a firearm. No shots in the dirt. No making a few adjustments before you start to impress yourself. Well a RTI is one of them.
Upvote 0
I do that often and always spot on but I wouldnt expect you to believe me as you have already made up your mind what you believe as for proving anything to you or anyone else, I don't feel the need. Enjoy your guns and I'll do the same.
Upvote 0
I believe you. Congratulations, you have some things figured out. It took me a while, experimenting and some machining to get mine to do it. I’m guessing you’re a 700mm guy?
Upvote 0
No, it's actually a 600mm bone stock. I like shorter guns. I did have a Wildcat M3 sniper .25 that was extremely accurate, but I sold it. I like my Impact because of the power capability but this is my hunting gun, its much lighter and for the distances I take most small game there is plenty of power.
Upvote 0
1st reg is a must if you shoot with low bar (80-120). Both the huma reg amd amp reg wil drop 2-4bar when reservoir is going fro 250-120bar. So if you want consistency through the whole fill do add a 1. reg (and put it close to your 2. reg bar) so the 2. reg sees same pressure when reservoir goes down from 250b.
It the same problem on all fx. When bar drop on reservoir the reg pressure drop a few bar as well --》hammer gets out of tune --》los of consistency.
I own 3 FX - same problem with them all - so I shoot directly ftom a 7l air bottle
It the same problem on all fx. When bar drop on reservoir the reg pressure drop a few bar as well --》hammer gets out of tune --》los of consistency.
I own 3 FX - same problem with them all - so I shoot directly ftom a 7l air bottle
Last edited:
Upvote 0