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Get a solid cheek weld on the stock, look through the peep sight, put the front sight on the target, squeeze the trigger. That's how Uncle Sam taught me to shoot an M1.

You should be able to see the sight and target through the rear sight if you have the butt in your shoulder your cheek pressed to the stock and your eyes open.

edit: I didn't mean to come across like a smart burro, I've seen too many folks try to shoot with their eyes closed, usually just before pulling the trigger.