three digit gas trap on Julia Auction

[fjruple]

SRS records indicate that s/n 1607 was sent to Winchester on Sept 19, 1938, for examination. was also test fired by Winchester.

Very early time period to send out an example of the "new" M1 Rifle. It would appear
that Remington nor any other potential manufacturer were not included.Attachment 83842

Any information on serial number 7898 which I have?

Thanks

--fjruple