The ACP Trigger features Frictionless Roller Catch Technology, consistent 3lb trigger pull with no creep and silent manual safety. Adjustable from one to two stage configurations. Standard model fits Micro 308 Short/315/335/355, Matrix 310/330/355/380/405/Sapphire, Phoenix/Vixen/Exocet 200/Exomax/Relayer Y25/Offspring. Bullpup model fits Micro Suppressor, Matrix Bulldog 330/380/400. Does not fit: Grizzly, GRZ2, G340, Axiom SMF, Ibex SMF, Matrix Cub, Matrix Sapphire, Equinox, Eclipse XT or Vortex.