Drop-In For Crisp, Light, Trigger Pull
Greatly improves trigger pull and let-off with no fitting required.
Surface-ground from hardened, 440C stainless steel, sapphire
honed and polished with a special return sear spring.
Big Book Catalog, Issue:65, Page:155
SPECS: Stainless steel. Hardened to Rc 83. Fits Ruger 77/22,
.22LR, .22 mag. and .22 Hornet.