I mostly use screwin tanks due to the ease of swapping
I fixed tanks on a couple guns,
1) My Twister has a old nitroduck mega-reg setup. Only reason is it has the matching ano cradle. The 2 tanks are out of hydro at this point & nearing the end of their life.
2) The other is a AA rapter on another cocker I have. Set it up for a old school look & that tank works well.