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I have a Remington M31 lightweight 20 gauge The receiver is some sort of alloy. Anyone have a guess on its name/composition? I don't.
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Remington called the material the Model 31L receivers were made of
Aeromet.
Remington Arms Co., Inc. put out a folder dated 1941 that introduces the new 1941 style Improved Model 31 and the new Model 31L with the Aeromet receiver.
Model 31L 1941 folder.jpg
By the June 10, 1941 Remington Arms Co., Inc. catalog they say the Model 31Ls are indefinitely delayed due to raw material shortages.
Model 31L June 10, 1941 catalog.jpg
No mention of the Model 31L in the 1942 Remington Arms Co., Inc. catalog.
Likewise not mentioned in the 1946 Remington Arms Co., Inc. catalog. The Model 31L makes its return in the 1947 Remington Arms Co., Inc. catalog in all three gauges.
I have seen a few with their receivers marked Model 31L, but most are just marked Model 31 the same as the steel receivers.
Model 31LA 103815.jpg