I.R. Co. rear sight

[rdpinwa]

Check out this link regarding the Rev 4 catch.

Carbine magazine catches - CMP Forums

Information

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[BrianQ]

Check out this link regarding the Rev 4 catch.

Carbine magazine catches - CMP Forums

That document, which I posted, is dated 29 Oct 1952. It references MWO ORD B28-4,released on 16 May 1945. The M magazine catch wasn't standardized until after the 30 round magazine was. Th e30 round magazine was standardized in April 1945.