-There is a belief that this was actually a Carbine case modified for the Garand, in order to fill a Q.M. order.
-Another theory is that this particular maker made a mistake in cutting the material and simply patched together the end piece.
-The last theory was that a surplus house modified these cases in the 1960's to include with the purchase of an M-1 Garand.
-Some have even said this variation was modified for use with the M1903 rifle.
I have seen a lot of these cases in the past 35 years of collecting, though most were un-modified pieces for both the M-1 carbine and Garand. I have one exactly the same as the one pictured which came with a Garand I bought a number of years ago. The Garand will fit, albeit a bit snug.
The case looks to be in decent condition, with all the straps intact...I assume the zipper works...if so that is a bonus.