I own a 2009 PBR .308 with a 20" bull fluted barrel, pre-64 Winchester Model 70 receiver, and green overmolded Hogue stock. It has a very heavy trigger but very crisp letoff and no creep. I know squat about triggers, especially on bolt action rifles. Are these triggers adjustable? If not, are there replaceable triggers that are adjustable? I want a "hair trigger" for this rifle. With my AR's, I just pop 'em out and pop in a 2-stage. But bolt action triggers are completely alien to me.