its a very simple job just two screws and it falls out , no matter what stock you get a bedding job would be bennificial.
second , Unless you absolutly have to have a McMillan stock their ar alot of other real good options that will cost you way less. Stockade Gun stocks makes a very nice stock that is made like the A5 and it actualy better built as it has an aluminum bedding block that runs up into the forend , cost about half what a McMillan does finished and aout 1/4 if you paint it yourself !! Joell Russo makes an A5 stock that is made from Laminated wood , you have to finish it yourself but the wood allows to shape it to fit your had better cost about half what the mac does and you'll have it finished , and up and shooting way before Mcmillan is supposed to have your stock to you. then their is Manners stocks they make an A-5 style that is repprtedly way better built than the mac and the shipping time is alot less , customer service is said to be top notch.
Here is a pic of one of Joel Russo's A-5 laminated stocks on my personal 260 (actualy a selfless bump for a couple friends , Joel and Nate)