The only change I made to mine was to swap out the extractor for a non-MIM one. I have made several other modifications to other guns. I end up getting most of my parts from Brownells.
I am a member at Stockertown Rod and Gun Club in stockertown pa. It is an outdoor range. The hours aren't great, and it is a very basic setup. The price is right at $40 per year and no per-visit fees.