SIG SAUER Trigger Bar Spring 220 Sao. When the hinged magazine door opens the spring is compressed and feeds the magazine in and out with no effort. The Sig Sauer Trigger Bar Spring 220 Sao SS1202707R has a one inch length of pull and a heavy welded trigger bow but it will fit any 220 model pistol with square cut trigger pins. This SS1202707R Sig Sauer Pistol Spring is made of high quality carbon steel and offers a smooth trigger pull with a darkened face and pinky tab so it is not a mushy experience. Specifications for SIG SAUER 220 Sao Trigger Bar Spring: Manufacturer: SIG SAUER Gun Make: SIG Sauer Gun Model: SIG Sauer P220 Condition: New Package Contents: SIG SAUER Trigger Bar Spring 220 Sao SS1202707R SIG SAUER Infinite Guarantee What firearm models does the manufacturer say SIG SAUER 220 Sao Trigger Bar Spring is compatible with? The manufacturer says that SIG SAUER 220 Sao Trigger Bar Spring is compatible with SIG Sauer P220SIG SAUER Trigger Bar Spring 220 Sao - 1202707-R