make excellent milling cutters in all sizes, even an old discarded one cutting through case hardening easily.

The Fissure burr, Figure 8, is one of the handiest of the lot. "A" is a plain burr, while "B" is a cross-cut Fissure. The sizes most commonly needed will be Nos. 557 to 562. Use it, for example, instead of a "mouse-rail" file for cutting the half round groove in a Springfield barrel through which the fixed stud pin is inserted. Cutting

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