It's an M38 that was refurbed sometime after manufacture. It got a 1943/1944 era M44 stock put on it. I could have happened in 1944 or 1964 or really anytime before it was imported to the USAicon. Impossible to know.

Plain no metal sling slots were first used in either late 1941 or early 1942 and were used up into early 1944.