The fact that Rick’s cyber-arm was shown in the season 3 trailer, and we all thought it was a big deal, and turns out it’s just a plunger gun makes this the best gag of the season so far.
I think the most interesting part is that this isn’t ricks native body, its one of the elder ricks. He stole the elder ricks body when he took down the council of ricks and the federation. Did all ricks get similar cybernetics or did rick spend a few months trying to figure out cybernetics he never had?