Cotis Member Joined Apr 26, 2021 Messages 196 Reaction score 450 Location Memphis, TN Nov 26, 2024 #1 My 686-3 4" is not drilled and tapped. Thinking about doing it. What is the factory thread size on the -4 and later models? Thanks
My 686-3 4" is not drilled and tapped. Thinking about doing it. What is the factory thread size on the -4 and later models? Thanks
CH4 US Veteran Bronze Supporter Joined Jul 30, 2014 Messages 11,988 Reaction score 29,117 Location Nevada Nov 26, 2024 #2 I believe it’s 6-40 Last edited: Dec 2, 2024