I purchased this M77 in .300 Win. Mag and it has a slanted forearm end on it. It was made in 1988 which was the second series of the original tang safety models which was before the Mark II models. It has a really nice piece of wood on it similar to the early No. 1s and all the checkering, grip cap and other items seem to be correct but the slanted forearm end has me perplexed. Never seen anything like it on a Ruger, any help would be appreciated.