Side-by-side comparison of a Stainless CRF feed magazine and PF 670/70A Blind Magazine... notice the angled-ear on the magazine block of the Stainless CRF model is pyramid-shaped, vs. the square shape of the PF magazine. To work with a CRF rifle, the squared lip will have to be modified to the shape of the CRF magazine lip:

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Here's the cast M70 Blind Trigger Guard... the units are pretty rough and thick. I had my smith bead blast off the baked-on finish, then I spent a couple hours with various files and sandpapers working it down to a finer shape, simultaneously eliminating casting marks and voids. Now, though not necessary, it's ready to be re-bead blasted:

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“Perfection is Achieved Not When There Is Nothing More to Add, But When There Is Nothing Left to Take Away” Antoine de Saint-Exupery