These complete firing pin assemblies install in Remington 700 bolts in just a few seconds with a Sinclair Firing Pin Tool (at right). The assembly replaces the OEM firing pin, the mainspring, and bolt shroud in both pre-lock and post-lock bolts. No firing pin disassembly is required. The PIERCEision firing pin assemblies give shooters a faster lock-time of 2.3 milliseconds and increase firing pin energy to 4.3 inlbs. In post-lock models you will also get rid of that convoluted firing pin spring. Assemblies are available in black and silver for both short and long actions. These will not work in Model 7’s, XR-100’s, XP-100’s, 788 or PSS actions.
Sinclair, Issue:3B, Page:247