How do I identify an M1stock? I have 2 carbines. The first is a Winchester serial #161xxx and the second is an Underwood, Blue Sky import serial# 6759xxx. The stock on the Winchester is slimmer than the other one. How can I tell if this is an original M1 stock? This Winchester carbine has a flat bolt, 2 hole upper hand guard and an Underwood barrel. I would appreciate any help.
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