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Yes, you guys are dead on its a McMillan M2A stock:
M2A
The M2A stock is a pistol grip M1A with a vertically adjustable saddle type cheekpiece. It is designed to be used as a long-range weapon when equipped with a scope. The adjustable cheekpiece allows the shooter to see through the scope and still maintain a desirable cheek weld. It must be bedded and is not legal for NRA Service Rifle Competition. For M14/M1A rifles only.
However, its pretty pricey at over $400 US, I really like it but not sure if I want to blow $400 US on a stock