Originally Posted by potentialglock
So if I were to buy a new hammer all I have to do is change them out? No gunsmith or other parts necessary?
Not necessarily. Any part purchased may need to have minor fitting.
The commander hammer will not work with the GI style grip safety.
The GI styled hammer will not work with the extended safety.
The sear may not work with the new hammer.
You may need to purchase the hammer strut and pin.
Even if just swapping out parts seems to work, there are steps required to ensure that the firearm functions in a safe manner.