Wilson Combat Bullet Proof Extractors are machined from solid steel and then heat treated for long lasting tension and toughness to resist chipping or breakage. The difference between Series 70 and Series 80 extractors is a plunger retainer stud machined into the Series 80 extractor. This retainer stud holds the firing pin safety plunger that is visible next to the disconnector rail in place on Colt-style Series 80 slides. All extractors which are designed to work in a Series 80 1911 will also work in all Series 70 guns, however extractors designed for Series 70 guns lack the machined cut which allows the firing pin lock plunger to be installed and therefore can not be used in Series 80 guns. Kimber series II guns can use either a 70 series or 80 series. All Springfield Armory 1911 pistols are 70 series.