Quick power up!

[thammer]

Other than enlarging the port from barrel to valve this is all you need to greatly improve performance of the Kral guns.

Power adjuster and barrel ported to 3/16" on both the .22/.25

Valve ported at an angle (20°)

.22 (5/32") = 30-35fpe
.25 (11/64 - 3/16") 45-60fpe

Kral Pro500 tune kit shown
Knight/Jumbo/SuperJumbo can't use an airstripper due to longer (full length of shroud) barrel.

Modified hammer to match factory Puncher Breaker specs.
2" OAL .059" wire diameter hammerspring with delrin spring guide (.25). .055" wire for (.22)
Smaller diameter delrin valve poppet/stem .375" OD
Airstripper (makes full shroud functional)

Instant performance increase and much more quiet with the functional shroud and debouce spring.

 

[Ranchibi]

Troy, you are so giving freely of your tunes and mods, you are a valued person in this community! Keep up the excellent work!

 

[magicmatt]

Hello Troy, this is what I did with my .25 empire xs, ported the valve, barrel, and valve back plate to 4.98 mm tried a fx impact heavier hammer spring from huma (didn’t work well) so went back to the stock spring maxed out and this is what I get. Do you think more is to be had?

 

[magicmatt]

Yes thank you very much Troy for all of your help and advice!

 

[thammer]

Hello Troy, this is what I did with my .25 empire xs, ported the valve, barrel, and valve back plate to 4.98 mm tried a fx impact heavier hammer spring from huma (didn’t work well) so went back to the stock spring maxed out and this is what I get. Do you think more is to be had? View attachment 291240

20 shots at 880 -900 is achievable but they seem more accurate at under 830-840 and I think that's because of the large airblast needed for 900fps disrupts the pellet. The airblast is exaggerated with it only having a 13" barrel.