The same chrome silicon firing pin springs used in the Speedlock kits above. Keeps easy bolt lift and trigger pull of a factory weight spring, with the improved ignition performance of an extra-power spring. Provides consistent, repeatable performance over thousands of compression cycles. Remington 700 Short & Long Action Springs feature DUO Spring Sets, two opposite facing springs to improve performance. Mfg: David Tubb SPECS: Chrome silicon. Heat treated, shot peened,stress relieved. Mauser 98 fits large ring and commercial.