In my opinion you have a quandary. A 6-48tpi tap will work but seeing that the front base screw hole is so shallow you should probably pull the barrel to tap through. There is what is called a bottom tap (tap sets normally have three taps in them, the "starter or taper" the second a "plug" and the last the "bottom") and those are good for full threading all the way down near the bottom,but the will hit the barrel threads and still not complete the process to the bottom of the hole. You must be careful to hold the tap in the same axis of the hole. In the even it does get messed up a smith can always open them up to the next size.
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