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During the early to mid period in 1940, some of the slides on the followers were round in the back to reduce the 20 degree back and provide more more space for the bolt (show in the middle of the...

Your butt plate is late Springfield from 1940.

You have to look really close at a Type 1 lock bar with a loop, as many fakes have been made up using a sleeve but yours looks good from what I can...