(1) I have been told that my Std Prod 2063636 was mfg about Oct/Nov 43. The receiver has a 7 on the left toward the front. It has an Underwood brl dated 3-43. Is it likely the orig brl from the Gov't free barrel program?

(2) When I tore it down, the op slide spring looked different. My books say the spring should be 10.25" long with 120 coils. Mine was 11.25 inches long and has only about 113 coils. Anyone know what it might be for? I don't guess it is for a carbine.

Much thanks for your help.
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