Your Mark should be a good rifle to shoot. AS others have noted, the stock is either a new replacement or a sanded, refinished & modified GI stock.

The Mark 1, in addition to the port in the receiver, has 4 unique parts that allowed it to function with the Pedersen Device. These parts are the trigger & sear; the magazine cut off; the spindle for the magazine cut off and the stock (which had a shallow cut under the ejection port.) Without these parts, a Mark 1 is just another 1903.

Good shooting with your rifles!
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