jtischauser
I'm addicted to kicking ass
Thought I'd share this excellent bit of info from Mark Passamaneck
"Basically the force on the hammer pin in a blowback is significantly higher than in a DI or Piston .223. As such, that pin can start to egg out the pin hole. In a standard trigger geometry, that geometry then changes and it causes predictable issues. In a drop in, it is less, but the hammer pin still takes a lot more force than the trigger pin. When you use locking pins, you transfer some of that energy to the trigger pin and mitigate the egging out of the hammer pin. Basically, the locking of the two pins prevents rolling (galling) and more rigid structure to spread out the energy. Especially the guys who are trying to use low mass buffers and springs, the hammer pin forces are extreme in blowbacks. In the MPX, it does not matter."
"Basically the force on the hammer pin in a blowback is significantly higher than in a DI or Piston .223. As such, that pin can start to egg out the pin hole. In a standard trigger geometry, that geometry then changes and it causes predictable issues. In a drop in, it is less, but the hammer pin still takes a lot more force than the trigger pin. When you use locking pins, you transfer some of that energy to the trigger pin and mitigate the egging out of the hammer pin. Basically, the locking of the two pins prevents rolling (galling) and more rigid structure to spread out the energy. Especially the guys who are trying to use low mass buffers and springs, the hammer pin forces are extreme in blowbacks. In the MPX, it does not matter."