Need 7/128 inch drill bit

What is 7/128 inch?
7/128=.0546
#54 drill=.055
Try tool suplly place.
 
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You will need a machine tool supply house to get number drill sizes. Busy Bee Tools usually has sets on reasonably. With these inexpensive sets hole diameters are "nominal" start a few thou below what you want to get and work up (say,start with a #56 and check for fit then drill to 55 etc.)
 
You could also check out your local CTC store. I picked up a set of drill bits from 1/16 to 1/2 inch in 1/16ths, I beleive, as well as all the numbered and lettered bits in one case. I got it on special at 50 or 60 %off. I think I paid in the neighbourhood of $40-50. They are also titanium nitride coated. They may not last as long as a porfessional set, but for the hobby gunsmith, I think they should last a long time.
 
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