Home Forums Hunting & Shooting Ask The Gunwriters Metallurgy, Ruger Investment Casting, Action Strength?

According to a Brian Pearce article on 77s, the Ruger castings actually tested as stronger than the bar stock that many other actions are machined from. Supposedly, the bar stock can shear along certain internal stress lines if memory serves.

MIM parts, on the other hand, aren't as dense as other steels (95% if I recall correctly). Kahr economy model autos feature MIM takedown levers that are somewhat larger than the machined ones on the high-end guns. The MIM rear sight on a Kimber Target II my son owned sheared off at the top of the dovetail just from recoil stress.