If you are comfortable working on one, a factory CZ trigger will safely go to about 3 oz. easily, sometimes a little less.The factory trigger will not lower safely for the pinch, I don't think. If I can get the Herb Smith modification(2 oz to 16oz range), it maybe possible. For the matches I shoot, no bipod, no 1 piece rest. So not sure how zero hold/trigger pinch could work. Could use/need an adjustable front rest(joy stick possibly). Considering pillars/bedding the action, do rimfire rifles benefit from bedding? Currently 15 inch pounds on the action screws.
My bad....I see you are talking about an M12.