Huben K1 mod
Hi all,
Wanted to share this.
Thought the trigger was kind of a chinese wall, so I did this:
and
This was a great improvement, it even got a second stage.
Regards, Robert.
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I heard someone talking about a Huben .25 that is already in the market?
Might have been a misprint but it was on another site.
Mike
I know this is an old post BUT,
I thought they had a K2 coming out?
Mike
An .223 barrel gives a little better performance,
but its diameter is bigger than the magazine diameter.
So real .223 amo won’t fit in the magazine, you will have to size it,
and then it will be a little to small for the barrel it selve.
So, unfortunately, the 41 grains rws are to long and thick for it.
I ended up shooting 16 grains jsb at 300m/s.
The new rod is made from galvanized steel (hydraulic) tubing, 6mm outer and 3 mm inner diameter.
But this is not that important, as long as it is just thicker.
I (soft) welded the 3mm threads in to it.
6 mm is a little to thick at some places, you’ll have to reduce it some.
It toke me some time bending and shaping it,
I wanted it to move completely freely.
When drilling the pivot hole I kept the pivot in the Original hole,
that way the drilling is a lot easier.
You wil have to dril through the base, the trigger and trigger sub frame.
Take good measurements.
Regards, Robert.
BTW, Robert: RE new trigger rod you’ve made – is it from tubing? Aluminum maybe?
Thank you, Robert!
Very much appreciate your kind attention & guidance, and data that will help me with my K-1. Last night I re-watched Gregor Kamenšek’s Video on full disassembly: https://www.youtube.com/watch?v=p7MLR_RPaYs and now think I need to drop back on the regulator pressure and open up the closing valve with the bottom adjuster knob (CCW rotation) to maybe reduce my air loss, while maintaining the velocity. 💡
Gregor has a new video on developing cast bullets to optimize power & accuracy: https://www.youtube.com/watch?v=x9WUhZ1CRl0 …
A key piece of info is the K-1’s barrel bore diameter is optimized for .223 sized projectiles! Aha! He has developed the solution I am seeking. I’ve cast my own pistol lead b4, so I’ll be taking this path quite soon, to ultimately get me to my goal of an accurate yet powerful small game & pest control “stealth” air rifle. Once set to this purpose, it’ll stay in that format. I wasn’t seeking a highly adjustable multipurpose toy – I’d rather have a single purpose tool, then buy something else for other uses.
At Your Service,
Wesley
Hi Wesley,
Jep, you are correct.
I relocated the pivot, drilled a 2,5mm hole +- 5 mm higher.
It makes the turning point of the trigger closer to the trigger rod,
resulting in a larger stroke.
Do not dril it more upwards, the trigger material will be to thin.
I made the rear lever longer, also resulting in a larger stroke.
I glued a small piece of rubber on the trigger between the trigger and the pressure tube.
Now the trigger is not hanging loose anymore.
Due to the stroke enlargement the trigger rod was a bit flexibel,
I made it stronger.
The stroke enlargement also gave the trigger a second stage,
you can feel it in the orginal state barely.
Til now I never had leaking isues.
Regards, Robert.
I am intrigued with your solution although a bit puzzled, since you did not provide a detailed write-up for the steps you took. It appears you relocated the pivot point for the trigger in relation to the actuation rod, and fabricated a new rear lever to increase leverage & rod travel at that end? 😉
Would you be willing to divulge the info I’d need to duplicate your success on my K1, please? Definitely trying to get the best performance out of this diamond in the rough… :biggrinn:
Not getting ANY support from the original “nameless” vendor after repeated attempts; obviously we are on our own.
:angrymob:
Also, have you experienced any problems with air leakage draining down your reservoir pressure? I shot mine tethered to my 60 min CF tank @ approx. 3.4Kpsi, pushing JSB Beast 34g pellets over chrony @1,030fps (regulator 20MPa) to sight in my Hawk Airmax scope. Rifle was left charged for six days & upon return, the gauge was reading regulator way down @ 6MPa! Another week later it’s down to 0. :sadn:
Any idea where to start looking for this problem? Might it be post regulator?
At your mercy,
Wesley Harris
Conway, AR
brotherwes@gmail.com
The trigger rod was still a bit flexibel, so I made a thicker one.
Total resulting in a light operable and predictable trigger.
Regards, Robert.
“chinese wal” What is that?
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I think this hammer less design is superior to the old classic!
in .25 you don’t have to have that long projectile to have the heavy weight… hopefully they do come out with a .25
Fingers crossed.
They still should improve that trigger from what I could see on the old posts