McMillan makes a stock for your rifle. I have had two on Interarms Mark Xs. Sold one to a friend. It weighs right at 2 lbs just as McMillan claims on their website.
Scroll down to see pic:
http://www.mcmillanusa.com/mcmillan-stocks-hunting-stock-list.php?subnav=branch2gMAUSER INTERARMS MARK X
This classic style stock has a straight comb and a small cheekpiece with some cast-off. The forend will accept custom barrels up to a #5 contour. It has crisp checkering appropriate for a classic stock. We offer completely finished "custom-drop-in" stocks for the Interarms Mark X action only. We do have inletting programs for most of the FN and 98 variations, but because of the many styles of bottom metal, custom bolt handles, barrels and safeties, we do not offer pre-finished drop-in stocks for them. We only offer 95% inletted blanks for gunsmiths to finish fitting, finishing and bedding. Available in right or left hand. Color shown, desert camo.
SPECIFICATIONS
overall length of stock: 31.5"
approx standard fill weight: 2 lbs
depth of action area: 1.8" (this will vary depending on action model)
max diameter action: 1.4"
forearm width: 1.660"
grip width: 1.365"
buttstock width: 1.7"
max L.O.P. with 1" recoil pad: 14.5" (1/2" spacer can be added to lengthen LOP)
drop @ comb: 5/8"