can't quite figure out if you are asking about two things or one...
stocks? No... the trigger mech is in the stock, so nobody is going to go to the trouble of trying to replicate all that.
as for optics... all options are going to be for the top of the receiver and the easiest thing to look for is anything that says it will fit a mini14 or 30 ranch style rifle... the indentions on top of the receiver are the same as for Ruger scope rings for those.... besides rings and optics that fit in them the easier way to go is a rail that fits these ...