I just finished build a peek valve and a new poppet for my friends theoben 22 it has az shroud on it I believe and a 400 cc steel bottle non regulated I measured the old valve it was a .200 throat and about a .305 metal poppet but the stem was stepped from .125 to .150 I made a new steel stem head to .305 and stem to .125 the new peek valve throat is .250 and t.p. to .250 we filled it to 3000 psi and I installed the heavy spring it came with from who ever power tuned it before and tried a 23 gr slug it hit 946 but with the tank only being 400 cc and the valve spring being stock it was a descending shot string I took 2 and 1/2 coils off the heavy spring and tried it it was 897 ish I gave the adjuster a 1/4 turn and it went to 900 905 ish stayed in that area for 24 shots with spread of about 17 he is going to bring it down again next weekend and we are going to try the heavy pellets 25 and 34 gr if the 23 gr slugs don't group for him so I'll get pictures of the peek valve and poppet I made for it next weekend I'm very pleased it worked out for him and seemed to seal up right away after the 2 clips it starts to fall off rather quickly and we found he needs to refill at about 2100 psi I didn't have to open the barrel port at all so we can swap out to the derlin valve and original poppet and different hammer spring so he can shoot the 18 gr pellets which he also has a lot of just like the 23 gr slugs so he will have options to shoot with valve and spring swap. I'll get pics next weekend of the valves side by side and springs along with the gun pics
