drill and tap size

[Taylor]

My brother gave me an Enders Royal Service 16 ga double.Mostly because it was broke.But on to the question.Are the sight beads a standard size? What are the thread size? 6-48? Thanks guy's.

[6bg6ga]

Maybe this will help

http://muzzlecouplings.com/measuring_thread_size.htm

[w5pv]

Invest in a tread pitch gauge and you will not be sorry for the investment.