I tried one
Hi All
Thank you for asking!
We have 2 swiss screw machines we make our extractors in.
Based on the extractor we designed for the Sig GSR project we introduced the HD extractor and it has worked very well.
The Hook is undercut 3 degrees to get a good bite into the rim.
The corner has a radius that is clean to avoid the usual stress riser of a square corner " Please break here"
The Practical came about, we just looked at the cycle time to make the HD extractor and aXed ourselves, Hay, what if we made the relief round to save time = saves money. We did some Calculations on the diameter of the shaft and how much force to bend the heat treated part. Very fancy set up involved a Very large Fish scale and some good old fashion sweat.
So we knocked off some time and pass it onto The GOOD peeps that we are fortunate to have buy our stuff. Same Geometry, same Material, Same heat treat.
I Saw this style a Long time ago, unsure if it was Detonics or AMT?
but I saved it and we got around to The Practical extractor and that is the rest of the story.
The slot for the FP stop, the Lenght etc are all carried over from the HD extractor.
Best regards,
Thank you for the work!
geo
EGW since 1991