Wait.....don't take it back. You can use the ProHunter barrels on the regular Encore frames, and vis-versa. I do!
Hinge pin....shouldn't be necessary right from the get go. And to tell you the truth, I wouldn't buy a frame that has had an over-sized pin driven in(personal thing, YMMV) and a lot of other people wouldn't either(if you ever consider selling).
But a hanger for the forearm is a great add-on. I use Stratton hangers and noticed a immediate improvement, cutting group size in half(or better).
The biggest problem(if you can call it a problem) is getting a good trigger job. The factory, anti-lawyer trigger just stinks, but there are folks out there that do an outstanding job 'cleaning them up'.
Beware of the snake oil.....
Scott