The SERIES I STONING FIXTURE is designed to save time and money by providing a repeatable setup for accurate adjustments, suitable for many guns, and comes with an adapter for the Ruger® 10/22®.
It allows for precise, measurable adjustments to the stoning angle for achieving the desired trigger pull weight, using a system of counting "clicks" to raise or lower the elevator and stoning guide.
The fixture is made of blued steel, measures 5 9⁄16" long x 2 9⁄16" wide x 3" high, and includes detailed instructions by Ron Power, but requires additional tools like a #10 Machinist’s Clamp and stones.