Here is some info
http://en.m.wikipedia.org/wiki/Metal_injection_moldingMost MIM parts are more pourious and not as well bound together at the molecular level. Metal ha a crystalline structure and forged and roled stock is better structured and denser. There for stronger than material that is MIM.
Surfaces that rub or parts that take stress need to be strong. I'm not getting anything with MIM parts if I can help it. I'm not saying they are all bad. Glock M&P and more have good reputations and use MIM parts. But some guns IMHO are better serviced by other parts. The big advantage in the DW 1911 is the parts that are MIM in other brands are TOOL STEEL. Much tougher and better suited for the job. It's just like knives. Yeah a knife out of cheaper steel can work. But there is a reason We buy Kin knives.
