CZ Custom TRS-Exclusive Custom Trigger Return Spring One Size. CZ Custom has fired test sample to excess of 20000 dry fires without breakage. Will not work in tactical Sports. Specifications for CZ Custom TRS-Exclusive Custom Trigger Return Spring: Manufacturer: CZ Custom Gun Make: CZ Gun Model: CZ 75 SP-01 CZ 85 CZ 75 Size: One Size Gun Type: Pistol Package Contents: CZ Custom TRS-Exclusive Custom Trigger Return Spring What firearm models does the manufacturer say CZ Custom TRS-Exclusive Custom Trigger Return Spring is compatible with? The manufacturer suggests that CZ Custom TRS-Exclusive Custom Trigger Return Spring is compatible with CZ 75 CZ 85 CZ 75 SP-01CZ Custom 10067: TRS-Exclusive Custom Trigger Return Spring One Size