1911 hammer pics
Left to Right
EMC
Norinco
Springfield with shelf
The half cock hammer position comes in really handy if you ever have a 1911 suffering from "hammer follow"
Sorry to borrow your pic, but it's handy. I have several hammers. Some have full cock dual sear contact points like the one with the strut. Some are single contact like the other two. I assume it's easier to achieve a sear/hammer mating using the single contact. I try not to use this type because it seems like too much pressure on the sear. I used to know the concept behind the design, but I'm old now, and I forgot.