Sig Sauer P365 SAS Meprolight FT Bullseye Sight Screw, M2.5x8. This steel constructed screw is manufactured for the 9mm Sig Sauer P365 SAS Meprolight FT Bullseye sights. This screw functions by retaining the sight and is perfect as a spare piece, immediate replacement, or for when you're ready to equip your Meprolight sight to your P365.