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Arisakas are easy to drill, it is the tapping that you have to be careful with. Heat treated 4140 is very abrasive and wears drill bits fast. It helps to sharpen the drill once and a while. I don't care what kind of set up a guy uses for gun work, what works is fine, but years back the drill press was pretty much the standard. Jigs and hand drills were common. Low RPM is everything with tough steels, and these tool types usually did not have much adjustment on RPM. It is easy to "Work harden" 4140 with high RPM and oil. I have worked on hundreds (Used to collect them) of Arisakas. Made bolts, shortened receivers, made takedowns, and NEVER had a receiver that was heat treated to the point of deflecting a drill, UNLESS somebody had messed with it (Applied a torch to loosen something). Type "I" receivers were cased, but I would not classify them as Arisakas.
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