Adjustable rear sights

[INLAND44]

Fortunately there were pictures and film taken of most all major actions, so possibly there would be a way to tell for sure, although there's not really any doubt that it was too early.

Information

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[DaveHH]

"The US Army in WW2" "Seizure of the Gilberts and Marshalls" These are genuine Army volumes with specific photos of the operations. I see a few carbines being used by Marines and Army personnel. No bayonet lugs and no adjustable sights indicated. This book covers the taking of Makin, Eniwetok, Kwajalein, Tarawa (Betio) and lesser islands. Later operations such as Iwo Jima, appear to show a much larger percentage of carbines.