Had a good old trigger i had been saving, decided it was time to replace the xmark, aint gonna happen on this action, this is a newer sps tactical, 223 in the pillar beded Houge, where the saftey arms come up, the action is not milled for the arm, its milled only the size of trigger housing, so i went to work on the xmark, they actually have two springs for pull weight, the screw under the trigger and the screw on the front of the housing, I removed the hog ring on the main pin the holds the trigger, slid the trigger enough that i could remove the hood spring they had in there, removed the front screw which looks like the same as the old screw, replaced both springs with the same old springs that the old trigger requires, real decent xmark now. ed