Below is a description and picture from the web. I need 7/32-40 threads which I believe was standard for this rear sight aperture. thanks
The “Sure-X” selective aperture disc was originally offered as an upgrade to Redfield or other similar receiver sights, it features eig
ht selective aperture sizes with increments of 0.004 in. from 0.030 to 0.058 in. with each size marked, it uses 7/32-40 threads
The “Sure-X” selective aperture disc was originally offered as an upgrade to Redfield or other similar receiver sights, it features eig
