06-27-2023, 01:30 PM
If taken as a square bottom recess the increased depth will remove material that supports the lugs in calculated shear. However the bolt design is a little more than simply boring out a 5.56 type bolt. Ignoring material and heat treatment correctly manufactured parts have changes to the lug root geometry as well as the radius at the bottom of the recess which is provisioned by the case design. Lugs themselves should be ground with a very slight angle to shift contact stress to the inner diameter.
Extractors should be austempered 4340 alloy with either a fully radiused back either side of the support flag or the surface raised by 0.011" compared to a 5.56 part. Conditioning is peened and burnished. Ideal is not phosphate and most definitely not chromed.
Extractors should be austempered 4340 alloy with either a fully radiused back either side of the support flag or the surface raised by 0.011" compared to a 5.56 part. Conditioning is peened and burnished. Ideal is not phosphate and most definitely not chromed.