Sentryduty's M1 Carbine

[JimF4M1s (Deceased)]

Interesting in that it's near the end of the first serial block of Inland production, it ends at 999999. Conversely, mine is near the beginning of this block 239XXX.

Your number is about a quarter of the way through the first block not near the beginning. If I remember correctly, 11 starts the block.