For Enfield, 10/22, Grooved Receiver .22's
One-piece. Allow use of Weaver rings on these guns.
Big Book Catalog, Issue:65, Page:260
SPECS: Aluminum, Blue. TO-10 Positions scope
further forward and ¼" (6.3mm) higher. Uses 7/8"/1" Tip-Off
Mounts or 7/8"/1" Top Mount Rings. TO-1 requires drilling
and tapping of receiver. Note: 7/8"= 22.2mm, 1"= 2.5cm.