Only big difference is accomplishing it by doing this you need an existing FRT or Alamo to reuse the housing and locking bar instead of purchasing a complete FRT-fifteen-3MD. "This is the modification necessary to get the greater-Mag S&W Adapter to operate While using the CMMG Sear Excursion, just file https://rare-breed-trigger90057.bcbloggers.com/34506641/the-2-minute-rule-for-rare-breed-triggers