Here ya go:
http://www.rimfirecentral.com/forums/showthread.php?t=500372
I would add to this that you would want to buy a 1/8" end mill bit such as this:
http://www.amazon.com/4Fl-SE-Carbide-End-Mill/dp/B000I6I5NK/ref=wl_it_dp_o_pC_nS_nC?ie=UTF8&colid=6DLPSP8PJG1R&coliid=I254EBGLXWGYX8
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The end mill bit will make it much easier to get the hole started on line. After you get the hole started in the barrel, you can switch to a regular 1/8" bit to finish the hole. If you don't have an end mill, the way you have to drill across the edge of the barrel will cause the bit to try to wander off.
This is assuming you are starting with a new barrel which comes without the groove for the pin, as I was. If you buy a used barrel, you'll have to hope the holes and groove line up. They probably will, but I just don't know. Marlin obviously drills the hole/groove into the barrel after it is installed into the receiver, so it's custom fit in each gun.
http://www.rimfirecentral.com/forums/showthread.php?t=500372
I would add to this that you would want to buy a 1/8" end mill bit such as this:
http://www.amazon.com/4Fl-SE-Carbide-End-Mill/dp/B000I6I5NK/ref=wl_it_dp_o_pC_nS_nC?ie=UTF8&colid=6DLPSP8PJG1R&coliid=I254EBGLXWGYX8
The end mill bit will make it much easier to get the hole started on line. After you get the hole started in the barrel, you can switch to a regular 1/8" bit to finish the hole. If you don't have an end mill, the way you have to drill across the edge of the barrel will cause the bit to try to wander off.
This is assuming you are starting with a new barrel which comes without the groove for the pin, as I was. If you buy a used barrel, you'll have to hope the holes and groove line up. They probably will, but I just don't know. Marlin obviously drills the hole/groove into the barrel after it is installed into the receiver, so it's custom fit in each gun.
