You don't say whether this gun is new to you or just owned a long time. Either way I'd be tempted to do the full strip and replace all the seals at the same time. Also the hammer spring and valve spring. Having stripped and polished all mine once I then bought a combro and found out that far from tipping the power over the edge it was actually way down. Turned out the springs were tired. Might as well do them at the same time.

You should really run it over a chrono when you're done to check that your tuning has not turned it up too high. On a pre anti-tamper you can adjust power. I'll PM you with how as not allowed on open forum.

Stripping it is a very good way to learn how it works, or it was for me.