Sig Sauer, Romeo1, Reflex Sight, Includes Adapters for Sig P227, P220, P226, P229, P320, 1911, Glock Standard Frame, Glock MOS, S&W M&P, S&W CORE, Springfield XD, HK P2000, CZ 75, Black Finish The ROMEO1 Miniature Reflex Sight is the ideal sighting solution for the modern semi-automatic pistol, MSR platforms, and shotguns. Three, reduced power springs for tuning and smoothing felt trigger pull. Fits the newer P220, P226 and P229's that use a short mainspring with a plastic, hammer spring base insert. Contains 1 each of 17, 18, and 19 lb., reduced power, mainsprings. P220 factory spring is 22 lb. P226 and P229 factory spring is 24 lb. Sig Sauer (Sigarms) Auto Pistols P226 Parts List Browse the selection of Sig Sauer P226 parts and the schematic available from Numrich Gun Parts today. Numrich is the world's largest supplier of gun parts and has been providing expert service since 1950.They will NOT fit newer models with the aluminum mainspring seat. Factory second products are completely functional. ... 27149 Factory Second- SIG Sauer P226 SAO X5 ... Performance Pak - For Sig P-226 contains 1 each 11 Lb. reduced power variable recoil spring, 18 Lb. extra power recoil spring, extra power firing pin spring and 17 Lb. reduced power hammer spring. **The current hammer spring included in this kit is the old style metal base long type.