Lyman 20 MJT Globe Front Sight with Inserts - 3201150A companion to the 90 MJT receiver sight. The 20 MJT - 7/8" diameter globe front sights are machined from one solid piece of steel designed to be mounted in a 3/8" barrel dovetail. 20 MJT height .700" from the bottom of dovetail to the aperture center supplied with seven Anschutz size steel apertures.