Forward Controls Design OPF-S RMR and OPF-S ACRO Pistol Sight Staccato 2011 P and C and C2 and CS Black RS OPF-S. For the non-Tritium (blacked out) rear sight use a 5/64 allen wrench to tighten the set screw provided to securely anchor the rear sight in OPF-S RMR's rear sight dovetail. Torque value: 5 to 7 in lb do not exceed 10 in lb. Specifications for Forward Controls Design OPF-S RMR and OPF-S ACRO Pistol Sight: Manufacturer: Forward Controls Design Gun Make: Staccato Gun Model: STI International Staccato CS STI International Staccato C STI International Staccato C2 STI International Staccato P Color: Black Gun Type: Pistol Size: One Size Package Contents: Forward Controls Design OPF-S RMR and OPF-S ACRO Pistol Sight What firearm models does the manufacturer say Forward Controls Design OPF-S RMR and OPF-S ACRO Pistol Sight is compatible with? The manufacturer says that Forward Controls Design OPF-S RMR and OPF-S ACRO Pistol Sight is compatible with STI International Staccato P STI International Staccato C2 STI International Staccato C STI International Staccato CSForward Controls Design RS OPF-S: OPF-S RMR and OPF-S ACRO Pistol Sight Staccato 2011 P and C and C2 and CS Black