Manufacturer: Thompson Center 8600
Thompson/Center Dimension LOC 3-lug, fluted bolts are stamped A, B, C or D for easy identification. They fit multiple calibers within a Series. This right hand bolt is a series "A" for .204 Ruger and .223 Remington calibers.
Specifications and Features:
Dimension series bolt
.204 Ruger, .223 Remington