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Harry Bonar · September 3, 2008, 04:42 PM

Sir;
Hey, Nick! Good to hear from you.
Douglas has a real process:
They buy their 4140 already heat treated.
They drill it.
They ream it and air guage it.
They button rifle it and air guage it.
They then stress relieve it, and, how much fun is this - the final "stress relief" give the bore the final dimension!!
Then it is checked by eye for straghtness, and given the final air guage.

When Fred told me about stress relief giving the bore the final dimension I thought "H---- Sh---!
They have the most sophisticated process I've ever seen! Mr. Depoy has retired but a very capable man has replaced him.
How do they make their buttons? They make them in a special area of the shop - a precision grinding area. G.R. Douglas designed this all himself - the rifling hydraulic presses are the same ones he designed and built!
Harry B.

September 3, 2008, 04:42 PM	#12
Harry Bonar Senior Member Join Date: December 5, 2004 Location: In the Vincent, Ohio general area. Posts: 1,804	bore Sir; Hey, Nick! Good to hear from you. Douglas has a real process: They buy their 4140 already heat treated. They drill it. They ream it and air guage it. They button rifle it and air guage it. They then stress relieve it, and, how much fun is this - the final "stress relief" give the bore the final dimension!! Then it is checked by eye for straghtness, and given the final air guage. When Fred told me about stress relief giving the bore the final dimension I thought "H---- Sh---! They have the most sophisticated process I've ever seen! Mr. Depoy has retired but a very capable man has replaced him. How do they make their buttons? They make them in a special area of the shop - a precision grinding area. G.R. Douglas designed this all himself - the rifling hydraulic presses are the same ones he designed and built! Harry B.