Might be They are just utilizing the exact same brand of kit, and Caspian simply copied the slide halt notch enhancement. Has any one at any time viewed it documented that the flame hardening on WWII slides was accomplished to circumvent cracking? Some army document that exclusively states hardening is https://www.whofish.org/Default.aspx?tabid=45&modid=379&action=detail&itemid=308935&rCode=33