shoot the rifle first. it may be quite accurate as is and you won't need a stock or trigger work. if you want a replacement stock, check those mentioned above as they are a great starting point. call a company named mcmillan and see if they offer a replacement. as for a scope, a good 4x, 6x, or 3x9x40might do all youwant todo with a 308. obviously there are other scopes out there, but would you take advantage of their higher magnification (and weight) hunting as you plan? look in the yellow pages for gunsmiths. call a few and ask if they can either lighten or add a replacement trigger. expect to spend 80-120.00 for a replacement trigger, and that is if they are even offered for the mossberg. good luck.

imo, you would be money ahead to look in some gunshop for a used remington model 700.