My guess is that the inconsistency comes from the valve rod riding on o rings free-riding against a cone shape hole. The o ring extrudes because it is not seated against a flat surface. Every shot needs to break the rod free, wearing the o ring down and creating gunk on the valve rod. The gunk (plus the stiction) create the inconsistency (and the need for numerous warm up shots after letting the gunk sit for more than 2 minutes). FX is aware of the issue btw (even Ernest made them aware long ago), they just don’t care cause impacts sell anyway.

You dont load properly the pellets in the magazine.the magazine comes out and you load it well then you put it on and you cock it and shoot.no way you lose pellets from this gun.i have it too and it works perdectly.

Again very informative Peter, thank you. Your unbiased videos set you apart from the rest. What might be a nice idea for a video is not only tuning for accuracy, but also for efficient air consumption. This is achieved by using a 20% higher regulator pressure than the pressure at which you have your ideal speed. This all without losing accuracy.

what scope are you using?

M8 gs88 Indonesia 🇲🇨

Thanks again Peter. I will definitely be fitting a Huma regulator and also a slug probe into my Dynamic.

Hello fellow shooter, thank you very much for passing on this information. I have been confused lately with my regulator for regulating well with a pressure of 200 bar from the bottle to 145 bar in the Plenum. Every time I put 240 bar in the 350cc bottle, the regulator suffered a lot and fired few shots constantly until it ran dry at 190 bar from the bottle. My regulator has 13 very thin plate springs that are quite sensitive to high pressure in the bottle. I will add another regulator and make a larger Plenum to use 110 bar with 90cc of Plenum. I will use thicker plate springs in the first regulator to work with more resistance and the second regulator with the standard springs. I use .177 pellet 13 grain. Greetings from Brazil 🇧🇷.

I do like KO’s , they work well in my Red Wolf in .22 , I was using the 20 grain KO’s in .22 and they worked really well .’

Thanks for informative brother big fan from northeast India👍🏼

Hi,Bro Peter Nice to see you......

I have shot quite a few 10 gr KO MK3 slugs lately. Not shooting them much out to +100 M but hitting a cardboard inner roll from duct tape, with 5 lines hold over and 10 - 15 CM to account for the wind, well surprising many little holes appeared in the cardboard roll on the wooden post at 120 M. Of course not going away from my 13 and 16 grain slugs, but i am shooting other stuff too, even pellets. Shot shed nice and comfortably, i assume soon you will have to take a break.

Godt valgt musik 🙃

Vildt 👍

With my experience. Size the JSB knockouts down to a 4.51 mm which is the same diameter as the Zan and you will get rid of that flyer. Just use a pellet sizer. They’re fairly cheap.

Du ligger et stort arbejde i det - Tak for det Peter 👍

Excelente vídeo

Fx impact m4❤

I am probaly a lilte late, but you made a great video demsonstrating the prosess. Even the end result maybe was not what you hoped for, just shows us your videos can be trusted. Having succes every time when changing something on a tune is not always guaranteed. A person affiliated with the manufacurer would probably had edited the video, or redone the entire video got have a guarenteed succefull outcom. Again this shows us you are honest about what you do:)

What magazine?

So interesting Peter. I've tested in .177 .22 & .25 in superior & Heavy barrels. I've found in EVERY barrel the old Knockouts are better than the Mk2's in 500mm and 700mm

Peter always enjoy your videos. This one is no exception...fantastic 😊

Why didn't you specify how many meters apart the groups are, I think that is an important part of the title of the video....

You have a unique ability to gain and maintain viewers do to using .177. Thank you

Thank you for doing this in .177 Great job.

I primarily watch your channel because you shoot 4.5mm. I love and prefer 4.5 mm. I have a .177 AirForce Talon 18" and enjoy it so much more than my fx impact .22, that i bought an Fx dynamic .177 compact and 600 mm. This was a great video. I am trying to get my Fx dynamic 600 mm to shoot the 13.4 jdb ko as well as my AF Talon does. You answered a major question i had. Does the FX 600 mm .177 come with a heavy liner or was that just .22 and up. Now that I know it does. I have confidence that I can get the fx dynamic. Shooting jsb ko 13.4gr as well as the talon 18" LW barrel.. which is not a slug barrel???. Cheers

I'm not a 4.5 mm fan , prefer 5.5 mm caliber

What kind of M4 is this, wich pellet size do you use ??

I have had my M4 Extended .22 for 1.5 weeks and it even shoots groups of 10cm in diameter at 50m, so really bad with the factory settings. After 3 evenings of trying with different pressure on the Plenum (standard 150B), it is now at 100Bar. The groups were getting better and better, but had grown to about 5cm. So not HOLE within HOLE. The factory speed of JSB 15.89 was 1225 ft/s or 375 m/s, so far above the speed of sound. (nice those loud bangs). Then I found out that the barrel was on the Slugs port (from the factory). Converted to the Pellet port and the speed went back to about 1020 ft/s. But unfortunately the group became smaller and smaller, but NOT HOLE in HOLE. Now 4 evenings later, I accidentally discovered that the JSB 18.1 shoots much better and is now (almost) Hole IN Hole. Ergo every version of the FX Impact M4 is different.

Grear video very informative on the weapon thanks alot, any chance you could do another with info on the m3 arrow-bolt modification ? best regards

what size hammer spring are you using also are you using soft valve spring or hard

My understanding is that they removed 1st reg for faster action for slugging, and gun will work fine like that.

Fantastic video thank you for sharing

Nice video as always. One question i have is what spring are you using in the front valve? The original one or the slug kit one?

Really interested in this muzzle brake but i really wanna see it tested on the panthera. great video as always though, love the testing and honesty, you are pretty much the only one doing these kinds of videos on the .177 calibers and the testing people do on bigger calibers don't necessarily translate well to the .177

Another great video Peter. Keep it up. Thanks!

Hello, I would like to upgrade my Panthera 6.36 compact to 600 mm. What parts do you think I would need to build it? Thanks in advance

Mijn M4 Extended .22 heb ik sinds 1,5 week en schiet zelfs op 50m groepjes van 10cm in doorsnede, dus echt slecht met de fabrieks instellingen. Na 3 avonden proberen met verschillen druk op de Plenum (was standaard 150B) staat deze nu op 100Bar. De groepjes gingen steeds beter maar was plm 5cm geworden. Dus niet GAT in GAT. De snelheid was af fabriek met JSB 15.89 1225 ft/s of 375 m/s dus ver boven de snelheid van het geluid. (wel leuk die luide knallen). Toen kwam ik erachter dat de loop op de Slugs poort stond (af fabriek). Omgezet naar de Pellet poort en de snelheid ging terug naar plm 1020 ft/s. Maar helaas de groepje werden steeds kleiner maar NIET GAT in GAT. Nu 4 avonden verder, kom ik per toeval achter dat de JSB 18.1 heel veel beter schieten en nu wel (bijna) Gat IN Gat. Ergo elke versie van de FX Impact M4 is anders.

Smart 👍

👍til Stefan's pin-probe "produktion" og din video.

😁 ja... Sådan noget kan vi jo godt li... Engang i mellem 👍😉

Hi Peter, Thank you for your efforts in testing the first stage regulator. I would like to confirm my understanding that the primary advantage of utilizing the first stage regulator is to ensure stable pressure, as well as to facilitate the use of a 300 Bar cylinder, which allows for an increased volume of air and consequently, more shots.

Try maxing out your hammer spring and valve adjuster for what ever reg setting you desire. Once you find your max velocity, adjust your valve tell the velocity begins to drop. Then lower your hammer spring adjuster until the velocity drops too. Adjust your hammer wheel until you find your desired velocity or accuracy

What speed are you shooting the 13 grain Zan slugs.

Hi Peter, Here's a tough question. My FX Panthera is a 600 mm arrel 22 caliber. I would have liked a 700 mm but it's just too long. I was told ideally a 30 grain or maybe a 32 grain slug with a 600 mm barrel is optimal. With a 700 mm Barrel you can easily shoot 40 grain 22 cal slugs. My question is you wanted more energy and switched over to say a 25 cal or a 30 cal barrel liner while keeping the 600 mm barrel can you make up the difference of not having a 700 barrel where you can shoot 40 grain 22 cal slugs? In other words will it somehow equal out shooting 600 mm Barrel 30 cal 40 grain slug as compared to shooting with a 700 mm barrel with a 22 caliber 40 grain slug in terms of accuracy and FPE / energy?

Hej med jer. Må man spørge hvor i landet i er fra. Er selv fra Horsens egnen. Skyder selv fx.

Another great video. I was wondering if you have the first shots being slow like the mk-3. I have tried your higher velocity then turning down the front adjuster. It still takes 8 or 10 shots until it comes up to where I want it. It just don't work on my mk-3. I will keep at it. Thanks again.

Great video, I used to tune I think is an old way , where first I will open the valve full open then power wheel on maximum power (16) . Then I will start shoot and increase the spring tension clicks until the speed will not increase any more. Next step I will turn the valve wheel to close by about 1/4 turn each time until the speed start to drop then ,then return ( open ) just about 1/4 to the to get that high speed .the third step is to shoot at each power wheel (example start from 8 , until 16) at each power I will make a group of five shots to find a best group which i will use to shoot at . But I think your new way it seems to me it will be better to try , because I think you tune valve at wanted speed so you will have No waste extra air which might cause inaccurate . I will try your way I hope for better results. Question: why you start by finding maximum speed then you go back to set the power wheel to the wanted speed + 20-30fps?, why you didn’t go to direct to find the wanted speed +20-30? Thanks for good video.

My bad ,I thought you had the Gen 3i. You have the Gen 2.

Why red band on stock? Mine has a green one. Same gun. Great vid. Thanks. 😊😊

Seen your grouping with M3 , don’t no why you would consider m4 so early considering no better results elseware just harsay??