Hm, not sure but if it is for GK1 (pistol), then I would not worry about twist rate unless you are shooting long range with it :)

BTW: for .22 cal, the twist rate is perfectly sufficient for any slugs, even boat tail. Only .25 cal has relatively slow twist that is not that good for slugs. At least that is the case on my K1s and GK1s.

It depends on the gun version and also the slug but in case of mine slugs in the video, .219 is best and also loads best in the magazine. .220 should be just fine as long and you can load them in the magazine without using excessive force.

@gregorkamensek3923 yeah.. .220 seems alittle snug but theyve got the dried bullet sizing lube on them..cant wait to get the .219 sizing bushing to see of any differences..be nice to find a barrel thatll fit with faster rate of twist OR a barrel available, say about 10" to 12" inches for these sbr sub carbine builds for switching out easily for back packing or survival defense type scenerio..the gk1 does have the capability to Expand into a survival, hunting genre of crossover pcp..im already seeing that this pistol can outshoot/ outpower my Walther Reign .22 rifle and ive shot my Walther at beyond 250 yards..the gk1 v3 .22 specimen ive got will shoot a small .35 inch or less 5 shot group at 40 yards off the bench( this being with 14.3gr Crosman Premier hp's and JSB 18.13) and a 3x12x44 scope( with a simple green dot sight itll stay around the same size ragged small hole group of less than 1" at 40 yds also..So, im looking forward to testing at 100 yds..eventually ill get the Huma regulator to install and id bet this pistol will do( just possible) be able to do bench rest accuracy at 100 yards..im up to start a You Tube review channel in the near future, so i hope to post my findings with the GK1 extensively very soon..

@@RaytheReviewer I saw this post second... For the projectile length that fit in magazine, the stock twist is perfectly sufficient. With my .22 K1, I am using this same barrel and those slug and they are extremely accurate and perfectly stabilized. It will even stabilize boat tail slugs that require more twist (for example ml V2 slugs or Altaros...). The .25 is more problematic because the barrels I have have only about 26" twist... Those barrels do not stabilize boat tail slugs. Regulator will improve your consistency and accuracy but will reduce the power significantly and also reduce the shot count at same power level. All the best with your KZbin channel :)

You mean how to sight in the open sights?

It is possible that the problem is that o-ring, but I still put bigger probability to the valve even if you don't see that there is anything wrong with it. I never had to remove that seal, but you are right, it is quite risky. There is a similar O-ring on K1 and KG1 that I did had to replace and it was a nightmare. One of my viewers actually made me a tool to for this removal afterwards that is basically a bent needle tip on a longer thicker rod. The trick it to just pierce through the o-ring and not go all the way to the aluminium. But I would still put my bet on the valve. Try to replace that first... BTW: can you hear the leak? If so, odes it sound different at different pressures? Does the sound different after each shot? Also possible is that the o-ring in the chamber where the valve goes in (and the valve spring) is leaking. Actually, that one is higher probability than the one you mentioned as well.

@@gregorkamensek3923 Thank you for your reply. I can gear the leak, less noisy at the begining but becoming louder and constand after I take a few more of shots. No difference at different bottle pressures until the bottle is completely empty

@@andreascharalambous6992 OK. that helps. Can you also check to what pressure the regulated pressure raises? It is possible that if the pressure does not get high enough that the valve does not seal... You should get to at least about 150 bars, then dry fire it a few times. This helps the valve to properly seat. All this is with assumption that the valve is not sealing which most likely scenario. If you have possibility, try to get another valve and when you replace it also replace the o-ring in the valve chamber...

@gregorkamensek3923 thanks Gregor, this means that I shall have to increase the reg. pressure to 150 bar or higher. I shall do as you recommend, let us hope it works.

😆. Will do :)

👍

Perfect size for the latest magazines of K1 and GK1 that I have see till now is about .2185 (5.55mm) but if the slug has rings and they have relatively small surface area and/or if it is relatively soft lead, then you can still push them in. My casted slugs from mold V2 (this video) fit just fine. V1 slugs do not. V3 slugs need to be sized to 5.55 mm as explained in the video.

Hi. Unfortunately, I did not make a video for Priest 2 but the guns are virtually the same, the big difference is that Prophet 2 and 3 have pressure assisted valve...

Thanks

Yes, I will at some point

@ awesome dude

Hi. At some point, I will be doing a general tuning video, for all calibers.

@@gregorkamensek3923 i look forward to it, thanks

I don't have any suggestion regarding rear sight. I am also not using this rifle with original stock anymore. This is what this gun look like now: kzbin.info/www/bejne/rImVlXl6o8uVjNE&t

Hi. At the moment, my favorite is 600 mm in .25 but all of them are so great. I my test, I got only about 7 -8 m/s more with 700 mm barrel... Honestly any config is very good but in my mind, 600 seem to be enough for .22 or .25. I also love 9 mm with 700mm barrel and also look forward to 700 mm in .30. At the moment my gun is still in US where we were using it for the EBR 2024... I hope to make a video about that in a week or two.

I assume you mean 100 bars ? In any case, lower pressure is an issue with K1/GK1. Also an option is that the oring on the pin that is pushing the indexing mechanism is damaged and cause friction. This should be replaced with NBR90 2.5 x 1,2 mm oring.

@@gregorkamensek3923 hi sorry yes I was originally on 150 bar all worked ok suddenly no rotation . I was advised to lower the pressure but it did not help . It read 10 on the guage 100 bar. I'm back up to 130 now. Still not rotating. I will look into the o ring although I'm not sure where or how. Thankyou

@@gregorkamensek3923 hi is that 2.5x1.2 or 4.5 I looked it up part 51 says indexing pin o ring 4.5x1.2 I have a service kit that came with it there's an o ring part 55 4.5x1.2 thanks.

@@vinceywinceyspider It is the oring that goes around 2.5 mm pin so I believe it is 2.5x1.2

@@gregorkamensek3923 hi the fault was part 43 a leaf spring that was broken in half.i have ordered 2. I have invented an easy Loader for the k1 . I'm getting good feedback from owners. Thanks for the help . Please pm me if interested

It definitely takes some effort to pump it. It depends on your body built. For a 105 kg person like me, it is not too hard :)

@@gregorkamensek3923 Thanks for your reply. Ahah ok I should get there ;) . Did you know how many shots the Huben can fire set to 300 bar and 40 joules with .22 15gr pellets?

@@AMPlinkeur I did not test this setup, but this might be a bit much for 15 grain pellet... I would assume you could get close to 2 magazines but this is just guessing. Much more efficient would be heavier pellet at this energy (for example Monster Redesign)

It is exactly .25 (6,35mm)

@@gregorkamensek3923 I asked because the sizes are different in the slugs. It is necessary to select the exact size for a specific barrel so that it shoots exactly like yours

@@HurshedRaupov Yes, very true. RTI RPB barrel is designed to use .250 size projectiles.

I have no idea.

Thanks for the input.

Yeah, it is quite normal. After the shot, the magazine is ready to index but if you bump it or rotate it slightly back, it will lock in position again. Not a very good design if you ask me.

It is 9 mm (closer to .354).

Yeah, nothing I can do about that. I am not running MP mold, I just designed the mold.

If I remember correctly, it is 3 mm Alen key.

Hello. You can reach me on email: stonemorek(at)gmail(dot)com

Hi. I can only speak for Vevor. It works for me but I should point out that I am not using it that frequently. If you ask me, Vevor will fill you guns without issues but I would not fill bottles with it as it will overheat and probably damage the o-ring. But some people are using it for bottles and seem to do just fine. It will definitely require some care and maintenance if you do so.

I don't use it. As I said in the video, most efficient removal of air is condensation which almost every compressor have. But yes, you will still get some amount of moisture inside. Not that big of a deal especially if your tanks are not made of steel...

I believe I have explained this in the video. You can remove the screw fully and the pistol will still function but it might dump air at lower pressure because the valve is too opened. The screw will not go out because of the smaller hole in the grip, but it will clearly reach max opened state before that happens.

@@gregorkamensek3923 thank you for responding. So, in your experience, how many turns out is fully effective where going beyond that doesn't accomplish more. In other words at a point of diminishing return you shouldn't open it up any further, that's the point I'm looking for. Can I open it 3 1/2 turns? 4 turns? I have a chronograph and using the recommended 2-1/2 turns I'm getting +-750 FPS with .25, 26gr slugs. Obviously, that's pretty good but I was, as people do, want to get the most posdible. Recommendations?

@@bobjoatmon1993 I believe it is in the video but I would not go out over 2 revolutions (2 revolutions from fully closed). My favorite setting is about 1.5 revolutions from minimum. This still puts out significant power and you can get at lease 1 magazine from 300 bar fill... The adjusting screw has no more effect after about 3 revolutions. You can expect slight variations the information I provided because this adjusting screw is slightly different in every pistol but it should not be more than 1/4 of revolution.

@@gregorkamensek3923 thank you very much for providing this answer

No, that will not give you more power. The first and safe mode you can do it to replace the transfer port with larger inner diameter. You can go up to 8-9 mm. But you should know that increasing the power on this gun will cause the cocking leaver to open when firing and you will get some blowback...

The only adjustment of trigger this rifle has is sear engagement. But you must be very careful with it as when you are making your second stage shorter, you are also making the trigger less safe... As you said, you can to this with the screw in front of the trigger...