Do these rugers have a series 80 style firin pin block, or a schwartz style? If series 80 style that would explain possible gritty trigger. I just handled a new colt defender at cabelas and its trigger was not nearly as smooth or crisp as 3 different kimber ultra carrys i also handled.
As for "upgrades", change what you want to change, whether to just make it look more appealing to you, or to make it fit you and your needs better.
I have swapped a few parts on my springfield, what i really want to swap next is the stress or load bearing parts for stronger, higher quality ones (slide lock, hammer, ejector). So far i have been happy with Ed brown parts, and the colt thumb safety i fitted i am happy with. Also the Harrison designs trigger turned out very well and love it
As for "upgrades", change what you want to change, whether to just make it look more appealing to you, or to make it fit you and your needs better.
I have swapped a few parts on my springfield, what i really want to swap next is the stress or load bearing parts for stronger, higher quality ones (slide lock, hammer, ejector). So far i have been happy with Ed brown parts, and the colt thumb safety i fitted i am happy with. Also the Harrison designs trigger turned out very well and love it