Charlie;
My belief is that the barrel lug wears due to lack of proper lubrication and not recoil. I always clean, then relube with a good grease, the radius of the lug, the sides of the lug, the radius of the frame where they meet the forend and the forend lug, fore and aft. Most of the wear on the forend lug occurs on the aft side of the lug (the side towards the receiver). If you take notice this has a slight angle to it and without proper lubrication will wear and cause the forend to become loose. Shoot 'em often, keep them clean and lube them for another 100yrs. of use.
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