Front sight insert round aperture only set to fit front sights such as Lyman 17a series, Browning BPCR, my small 17 series sights and others.
Front sight insert round aperture only set to fit front sights such as Lyman 17a series, Browning BPCR, my small 17 series sights and others.
It consists of ten inserts on one card, all of which are round apertures, as seen in the picture.
The outer diameter of the inserts is .474" (12.05mm)where it fits into the body of the sight. The two alignment tabs are on the centerline of the insert, and measure approximately 1/16" top to bottom. The inserts are made from .010" thick spring steel and are generally blue, but may vary in color from bright blue to a dull brown.
Because of the manufacturing process we use to make these insert sets the edge is not flat. It protrudes in the center so the aiming surface is actually narrower than the thickness of the insert, giving a sharp, clear sight picture.
Also because of the very thin nature of the inserts it is possible to install more than one insert at a time in most sights to allow customization of your sight picture. For instance I use the middle and large ring apertures together to make the annulus appear heavier and easier to see in all light.