Tuning Little help with an airforce condor SS

So I have a .25 Airforce Condor SS (I think modified by R&L or with their parts) that I got used a couple years back. It never held air long so I am FINALLY getting around to fixing the leaky bottle. The gauge is bad. It won’t go to zero so I know it isn’t reading full right. The top hat leaks at the nipple. What’s the hood source for a new top hat stem (preferably one this large), the o-rings to rebuild the valve, a new gauge, and probably the tool to decapitate the bottle? I live in Louisville, KY if someone knows a local place…even better. The gun is great fun to shoot and exceptionally quiet. There appear to be two weights, a hammer with rubber fittings on both ends, a plastic bolt and a 5 baffle moderator on the gun. I really enjoy it and hope to have the bottle back up and running (without bleeding cash like crazy).

thanks in advance! Oh, and yes, I tried to drive out the punch for the top hat but I don’t have a punch smaller than 1/16, I did try to clean the black plastic stud on the bottom by chucking the top hat in my drill and using OOOO wool and a paint scraper to get into the top of it. Still won’t seat and hold air.

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The black piece is derlin and it should pop off the stem they are press fit on once you pop off the black derlin seal the rest of it pulls out looks like the derlin has a hole in the back of it which would cause a leak threw the valve the silver top hat will pull out and you should see o ring inside the brass piece go to air force site and order the orings and a new derlin seal and also the oring for between the bottle and black adapter to get that apart I'd put rubber around the bottle and put it in a vise and either use a punch that fits the hole tightly and turn it out or use the Punch and tap it loose they are right hand threads then just replace orings insert top hat threw the brass and tap the new derlin on the stem you should be able to feel it bounce a little when seated all the way put the adapter back in the bottle with new oring and screw piece of brass and top hat piece back into the adapter / bottle it just has to be snug not super tight may have to clean up the brass seating area and polish it don't change the seating angle at all maybe just hit it with a scotch bright pad and then polish the area using a Dremel or drill with polishing wheel and good metal polish again don't change angles once all assembled I would use a big bottle to fill it and hit fast at first to get the poppet to seal you can use silicone airgun oil to lube orings if wanted but only that nothing else if u use silicone airgun oil use it sparingly it's easy once you pop off the derlin check to see if there is a hole threw the center that's the way it looks in the picture I'd also fill the bottle out of the gun and once you get a good amount of air in it use soap water to check for leaks if no bubbles are found I'd leave it sit overnight and see if it lost any air you got it apart that far you should be able to handle it go to airforce.com should be able to get those parts for a condor bottle valve 
 
It appears that your frame is spinlock..I know you don't want to trow a ton of cash..you could buy the parts needed directly from AF they have a awesome service..the gauge could be changed for a wika it fit no problem..the derin black part order 2 atleast because the hammer striking the valve with time makes a damage n the valve will not seat .. damage clearly visible in your first pic .. but if you really want to make it a more enjoyable rifle order a new Rimrock valve it will make the rifle completely tunable for any weight of of ammunition you want to use.