Take it to a gunsmith.

It is waaaaaaaaay to easy to screw up a stock or recoil pad when grinding one to fit a stock. Then you are out even more money. And honestly unless you have been doing it for years you reallyneed a recoil pad jig to get the angles perfect with the stock.

I charge $45 for the labor of cutting the stock to the desired length, squaring it up, grinding the recoil pad to fit and then finishing the recoil pad to look like it came on the gun whenit was new. Usually it looks better than one that would come on many guns new.

It is worth the additional $45. This way you won't need to buy another stock or multiple recoil pads when the first couple get mucked up cause it is very easy to grind too much and get the angles wrong or backwards.