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My M1a and M1 both used to bust my upper lip with the receiver shroud/cover. The only way I could find to mitigate was the really high grip with the web of the thumb wrapped around the shroud an the lip on the thumb. After awhile it just sort of all works together.
On most of my other rifles I will point the shooting thumb towards the muzzle along the stock/receiver mating area, or another suitable spot.
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