The 875-100-3 part of Winchester is the complete bolt assembly for its bolt-action Model 88 lever-action rifles. This includes the receiver, firing pin, extractor, ejector, and the bolt body with handle. It also includes the internal components such as the hammer, trigger, sear, and locking block. The 875-100-3 is compatible with all Model 88 rifles in .308, .30-06, and .243 calibers. It is also compatible with all variants of the Winchester Model 88 Classic and WinLite deer rifles.