Brocock/BRK Brocock Commander Magnum XR .25 Tuning?

Currently big into rimfire but looking to update some other stuff in the gun room.

Wanting to fine tune my BRK Commander XR magnum .25 for optimal performance @ and past 100 yards. Have to go through it as my brother left it in the rain while I was last deployed. Tank is slowly losing pressure as well.

When I left it was shooting dimes @40yd. Hadn’t messed with it since I saw a little rust and was told what happened.

Anyone have one of these? Right now it has a Bushnell Match Pro ED, Ergo 0 grip, and saber tactical bottom pic rail w/ Atlas BT 65.

Was considering a 700cc tank, adding a FabArms R.A.P stock (or other PRS style), and finding a longer ARCA to replace the saber pic.

Admittedly, I am not sure how to best tune it would be and am looking for advice or sending it off for a full cleaning/tuning. Thanks to all in advance.
 
Appreciate all of the info gentlemen! I had actually spoken with AOA via email, but they didn’t mention sending it in for service. They did send a quote for all of the items we discussed. As of now I am going to order an o-ring kit and try to go through it myself.


Pretty sure my regulator is leaking as the reg pressure creeps up. There is also air coming out of the small hole between the reg and tank psi gauges. Am going to have to make a tool to get regular out as it is pretty well stuck in.



On another note, has anyone upgraded to a 700cc tank and the adjustable (new) Brocock/BRK trigger? Would like to get it tuned and dialed in then possibly shoot some matches with it.

Thanks again for all the help and input!!