Cleaned and doble check everything an reassemble it and gave a last try until i get my bottle refilled.
Connect the hose still leaked and dry fire four five times......yayyy
it started filling. What a relief.
Thank you so much for your guide.

Is there any o ring in the valve stem. Mine doesnt have it. Yes ive tried filling while cocking and cleaning doesnt work, i dont have a bottle and cannot try blasting air in.

Ive just installed lane regulator to my s510 fac. After reassembling it i tried filling it but air passes through the valve through the transfer port. I cant figure out waht i have done wrong.

Thanks singlespeed. Thats what i was hoping to try out. Opening the transfer port fully and adjust the power through the spring tension of the firing pot. do post your full string. And any other changes if its not too much a problem.

Thanks for the reply. And what about the power adjuster? Does it still works?

Is the installation of the regulator simple? Any other changes made besides drilling the breath hole and installing the reg.
im planning on doing the same with my s510 as well

Which one do you prefer air arms s510 fac walnut stock or fx wildcat both in .22 cal.

Thanks Blackbaronfish. I was actually hoping that i will be getting more shots if i was able to increase my fill pressure. With 18.13 jsb at half power my string starts from 790 peaked at 804 and after 30 shots it was down to 785, at shot no 44 it was 778, was eager to get the extra six shots. Thank...

Has anyone tried filling up your S510 above 2900 psi. is it too much of a risk?

Sorry, I forgot to mention the gun. Its Air Arms S510 Xtra .22