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Single-flute solid carbide drills, specially ground, are highly recommended for use by professional gun trades on hard receivers, such as 03A3 and harder ones. They are capable of cutting clean chips in the hardest file steel, resulting in a true hole. Unlike other drills, they do not cause crumbles or chatter in the steel.

Being 2 inches long, they provide enough quill clearance when used with Forster and other scope/sight mounting jigs. As long as they are kept clean, they will not bind or break. When properly fed, they prevent work-hardening the hole surface that often results in spade drills, thus decreasing tap breakage.

These drills can drill through hardened steels all the way through. Nonetheless, common sense must prevail, and there is no guarantee against breakage. They should only be used to crack the skin on Krags and other tough gun parts. Do not use them on softer steels, and only after other drills have failed or the hardness of the steel to be drilled is pre-known.