The Gold 15# hammer spring is recommended for range/competition use and “most” primers. Yellow 18# hammer spring is the one for any/all primers and ammo.
Made in the USA music wire 18# Yellow “self-defense” hammer spring and our “Gold” 15# range/competition use hammer spring. Yellow/self defense will set off any primer, so if it absolutely has to go “bang”, this is the spring. Includes matching firing pin spring and firing pin block plunger spring.