Super low power from Kral Puncher Mega

[Freddich]

Hey! Just got my .22 kral puncher mega and it is somehow putting out less energy than any of my 177 springers. Unfortunately, as Amazon messed up my order for a chrony and sent me a few dvd's instead (wtf), I won't have that until next week, but for reference; when I shoot it at a regular 1x4" plank of wood the pellet makes a dent about 4-5mm deep and bounces back out. I assume this is not normal?

If anyone has one of these and is willing to measure some stuff to see if mine is the same, I'd be very thankful! I would also love to know if anyone knows anything I'm doing wrong, as I'm new to PCPs! Thanks in advance!

 

[JimNM]

check the power wheel on the side of the gun. make sure it is turned all the way up.

what pellets are you shooting? you should be around 28-32 FPE stock.

 

[TNT19]

Hey Friedrich, I have to puncher breakers. Check the power adjuster on the gun to see where it is set at. From there move it to the lowest setting then back to the highest.

 

[Freddich]

Yeah first thing I did was check the power adjuster, seems like it does work, however the results I posted are with it maxed out. Lowering it will decrease power even further.



EDIT: Oh, and I'm using JSB Jumbo heavy, 18.13 grain, Read that they should perform really well in this gun!

 

[JimNM]

How much pressure do you have in the gun? extra high pressure will not allow the valve to open and will give low output. 

 

[Freddich]

I first filled it to 200bar, and have shot it to about 130-140 at this point. Roughly the same power throughout.

 

[JimNM]

did you get a reduced power gun (like for UK at sub 12 ft lbs?)

 

[Freddich]

Yep, it was originally made for the Swedish market, 10J, as I have a license I contacted the seller, who told me that the only difference between my gun and a fac one was a small set screw blocking the power adjuster. I removed it, and aside from the fact that the hole in the power adjuster is tapped, I am told it is supposed to be exactly like the original version. Hence why I would like to compare some parts with another gun.

Also, the guns are modified in-house by the seller from original guns, so I expect they would know if anything else is different from the regular version. Aside from that, I measured the hammer spring, which seems to be the sam length, but I have no way of verifying the thickness.

 

[TNT19]

Sounds to me like that is not a fac gun. Both my 22 and 25 were 28 ft lbs and 40 ft lbs right out the box. I have modified them both to be 32 ft lbs, and 48 ft lbs since.

 

[JimNM]

with a 2mm hex wrench, loosen the rear, left set screw that is just in front of the magazine.





Then

 Press/pull the knob to remove.

the transfer port port should be just over 3mm.

 

[JimNM]

forgot the last photo.

 

[Freddich]

Yeah, just looked at the same thing, those measurements match up!

 

[TNT19]

Is there any one close to you that can let you borrow a chrony to test fps?

 

[Freddich]

Is there any one close to you that can let you borrow a chrony to test fps?

No need, I ordered a new one as soon as I discovered Amazon messed up my order, it should arrive in the beginning of next week! If I can't solve it by then I'll be back here with the results!

 

[TNT19]

Hoping for the best man. I really like both my Kral puncher breakers in the bullpup configuration. Both have been easy to work on and mad accurate all the way to 100 yards.

 

[Freddich]

Hey guys, I'm back after some testing with the chrono. My suspicions were indeed correct, not only does it not perform that well, it performs terribly! I shot 2 whole 12 shot mags of JSB heavies (18.13gr) through it and the average speed was 100,6 m/s, around 300fps from a 200 bar fill.

This means that the output is about 6 joules, or 4.5 foot pounds. Now let's start some real investigating!

 

[mag_de_mars]

does your rifle is regulated? do you have fac spring 

have you tried to turn clockwise the hammerspring tensionning screw?

start here, and if even with hammerspring fully loaded you don't obtain the power, maybe is a weak hammerspring like sub 12 rifles

 

[Freddich]

does your rifle is regulated? do you have fac spring 

have you tried to turn clockwise the hammerspring tensionning screw?

start here, and if even with hammerspring fully loaded you don't obtain the power, maybe is a weak hammerspring like sub 12 rifles

Indeed I have tried adjusting tension on the hammer spring and it has no appreciable effect on power. A weaker spring is a possibility, is anyone willing to measure the wire diameter of their spring? From googling I am fairly sure mine is at least the same length as a stock one!

 

[mag_de_mars]

Have you checked the barrel alignement with transfert port .

I mean the barrel TP is misaligned with the block.

This problem happened to a Friend and the power fall drastically

 

[Freddich]

That did it! Thank you very much for the help!