Kral Arms Another parts gun.

[thammer]

I have a few bins full of Kral parts. Every now and again I find a part and it causes me to build a full gun around that single part. I picked up some Winchester Mod100 barrels years ago in .308. I had profiled one to fit a Kral action probably 2017ish. I see it from time to time while looking for other things. Today I found a carbon fiber tube with a 14mm ID. That reminded me of the barrel and it went from there...

19" .308 barrel. Sleeved in CF with a press fit bushing on the end for the barrel band. A Kral Mega action. A Puncher Breaker tube with the mega fill end. A JSAR valve and cocking Lever. A mega stock and a Donnyfl to finish it off.

The valve are known to make huge power and the ports are definitely there in this rifle.

It will likely become my Coyote rig. Only gets a few shots a fill but light even with the steel tube. Should still make near 100fpe even with that short barrel. Lots of hammer weight and spring testing. Anyone not familiar with the JSAR valve it breaths fire but not real tune friendly. It wants to open all the way on every shot unless you really balance the hammer weight and springs.

It's in a wood stock now and can't decide to keep her there or put her in a synthetic.

 

[thammer]

8mm bolt becomes a very nice larger replacement power adjuster for the Kral guns when you need more air flow.

 

[BBGunn]

Love it! My kind of rifle! Nice work!

Would be an excellent coyote calling rifle as you don't need many shots per fill.

 

[Ranchibi]

Troy! Nice work! You built quite a BEAST....yotes beware! Get'em!

 

[ZekeZX10]

That is awesome you can mod stuff like that, I gotta learn how and get a simple machine shop for myself!

 

[thammer]

That is awesome you can mod stuff like that, I gotta learn how and get a simple machine shop for myself!

I started with hand tools, then got a drill press, next a mini lathe from Harbor freight, then added a mini milling machine, then upgraded the lathe to a Grizzly G0752. That's what I run now. Went slow and added as I learned.

 

[thammer]

964
967
970
962
931
929
934

7 shot string with 44.75JSB

I doubt I'd need more than that for a night of raccoon, fox, or coyotes. I keep my small buddy bottle in the backpack of I do.

 

[Pale_Rider]

Cool build. The JSAR valve sounds similar to Don Cothran’s valve functions.

I’d keep the wood stock over the synthetic all day.

 

[thammer]

Cool build. The JSAR valve sounds similar to Don Cothran’s valve functions.

I’d keep the wood stock over the synthetic all day.

It's very similar to the Cothran valve. That's exactly where the idea came from but a few minor differences.

 

[Motorhead]

Yup ..... Light hammer in freeflight or better yet an SSG devise
Buffered poppet lift limiting if you can figure out a way makes for a VERY snappy yet high output pressure pulse to barrel !!! and more shots too being quieter to boot.

Very slick rig you have built there Hugh

 

[thammer]

Ended up with a 37gram hammer in freeflight.

Final tune
With FX 44.8

With FX Hybrids

I modified a Rainstorm magazine and the breech of the rifle to accept it. Nice quality all metal 7 shots. All this gun needs.

I also added a second CF sleeve over the first plus have a barrel band so it's rock solid.

 

[thammer]

Changed out the springs "AGAIN"... LOL Twin spring plenty of free flight. New string with FX Hybrids this is exactly what I wanted when I started the build.

44.5gr FX Hybrids
1. 987
2. 978
3. 975
4. 978
5. 969
6. 959
7. 955

Should keep a similar string with the 50gr JSB. From a 19" barrel I'm thrilled. I'll use it almost exclusively under 50yards so unless the pellets are ridiculously more accurate than the Hybrids it will probably always be a slug shooter.