How do I determine what is or isn't a mim hammer, I don't know the mim term.
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MIM is an acronym meaning Metal Injection Molding.
It is a method of manufacturing very dimensionally consistent parts with very low rejection rates (as compared to forged and machined parts) from powdered metal.
These MIM parts were used on S&W pistols in the later years. (After 1995 as I recall.)
One happy benefit of the MIM process is that the parts are very smooth.
The most common cause of roughness in the trigger pull is from the curved area on the base of the hammer dragging on the sear as the trigger is pulled. (It's OK. It's supposed to do that.) On forged and machined hammers, that area is often very rough, hence the gritty trigger pull.
As all of the S&W hammers are pretty much interchangeable, any spur hammer will work and you could install an earlier forged hammer but you would still probably have a gritty trigger unless you smoothed that lower hammer area.
A MIM hammer would not require smoothing which would save you a step.
MIM hammers can be easily identified by their sunken sides.
Forged and machined hammers are full thickness.
Forged and machined hammers can be had in black or silver.
MIM hammers come in any color you want so long as it's black.
John
