I have the McMillan A-5 stock for my savage with the thumb wheel cheek rest with the flush mount cups with the quick release swivel studs (think dunlop strap locks for guitars) and the spacer system. the only problem i ran into was that the rear reciever screw was a bit too long, so when I torqued it up it binded the bolt, but 2 minutes with a dremel fixed that right up.
if i had to do it all over again, i might have gone with the saddle cheek rest nut I'm not completely sure as i don't have any hands on experience with that part. all in all though, I love the stock.
as far as swapping stocks, all you need is an allen wrench and about 5 minutes, you really can't make it any easier.
your best bet is to call them to place your order, some really great people work there, very helpful, info youll need before hand is model of the rifle, type of barrel, if its factory I'm sure they'll know its diameter and taper. short action\long action, left or right hand bolt, pre accu trigger or accu trigger. also have in mind what sort of finish you're going to want, and the various options.
