I have an original copy of "FM 23-7 War Department basic Field Manual U.S. Carbine Caliber .30 M1 and M1A1 23 APRIL, 1944"
On pages 4 and 5 they refer to newer issued carbines having the adjustable rear sight (showing some excellent line drawing pictures of a Type 2), and earlier issue carbines having the L Type sight.
It shows that when the FM was authorized in April, 1944 the Type 2s were at least pending issue.
Just a little fact.
BTW, this is a great little manual on the Carbine. It is comprehensive with not only cleaning, but sighting, courses of fire, firing position and tactics to employ. It is 6 3/4" by 4 1/2" and has 209 pages.
I have half a dozen of various different manuals and years, but this is my favorite. Mine is an original in excellent condition, but the paper is really starting to age, so it sits in the gun safe most of the time. I may read it this week end while my wife is gone!Information
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