Congratulations on your acquisition, your 77/22 is built to last for generations. A rifle manufactured in 2002 will have a slip fit or "switch barrel" receiver. As remembered (someone will correct me if wrong) Ruger contracted with Wilson Barrels up to some point, Wilson supplied barrels of various quality depending on the specifications of contract, Hand lapped, Cooper is (was?) one such purchaser. If your rifle doesn't shoot to your satisfaction CPC or Clarke will fine tune your rifle. As another option it's an easy swap to one from Lothar Walther, Shillen, or Lilja. With the exchange of barrel, trigger guard and magazine, your rifle can be adapted to .17hm2, .17hmr or .22mag. Your rifle is built for the long haul but if needed parts are relatively reasonably priced from Midway or Natchez. If you think it an improvement an easy exchange of trigger spring will give it a pull you can live with or love.
Enjoy your new rifle!