The SERIES II STONING FIXTURE is designed for achieving a consistent and clean trigger pull on semi-automatic firearms, specifically fitting M16/AR-15 with .154" diameter pins.
It features an adjustable design with interchangeable Adapters for precision, and requires the Series II India Stone or Series II Hard Arkansas Stone, which are sold separately.
The product includes a steel, blued fixture with 1 Adapter, hammer and sear clamp, three Allen wrenches, and instructions for use.