MIM is a technology when metal dust is assorted in wax,and that is then under high pressure pushed into the form and then it is sweltered.Already from initial principle,where MIM parts are parts from dust joined with pressure and heat,components MIM are cellular.Thanks to which are few levels more fragile then solid cast or forging.
MIM is of course fantastic method for components,which are not mechanically strained.For mechanically strained components it is possible to use only if they are overequipped in thickness.it is the case of HK hammer.SIG uses CAST ,with SW revolver the hammer is not overused,therefore the MIM in there is without a problem.
The construction side of K100 is designed that firing pin is inside the hammer.Our hammer is hollow and walls are relatively thin and MIM can be used on the components really only when they have thick walls.
Cast for Slide: at the present when using high-alloyed CrNiMo steel for Cast production reach better parametres compare to use of low-alloyed steel in form of solid steel.
Cast for slide use Colt,STI,Para ordonance,BUL,and of course K100.Just over in Canada you have a company which makes very good casts for all US and Canada producers:
http://www.alphacasting.com/realisations/police.html
Why other producers use solid steel? answer: PRICE.
if I buy cast from foundry for 200USD and material in raw bar form it costs 2 USD per kilo,providing you use CNC technology,treatment of raw Bar to semiproduct into CAST form will not cost more then 10 USD(of course if the shape of the component is suitable to be treated by CNC technology)For example we invested money in technology of the cast of steel insert component however after producing cca 2000 pistols we came back to production technology from raw bar by CNC we save cca 10USD compare to use of cast which cost us 15USD.
Unfortunately the slide of K100 has locking items designed in the way that use of CNC is slow,therefore we use CAST and CNC is used for final works.
Regards,