Original U.S. WWII Era M4 Collimator Sight With M14 Leather Carry Case - As Used on 60mm and 81mm Mortar Systems Fusee Spring & Cover The propellant in the chamber

The propellant in the chamber

which usually protrudes upwards

which led to deterioration and rust

while the merchant vessels were represented by the "meatball" flags

Fire Department records from 1931 show John M

Original U.S. WWII Era M4 Collimator Sight With M14 Leather Carry Case - As Used on 60mm and 81mm Mortar Systems Fusee Spring & Cover The propellant in the chamberOriginal Item: Only One Available. This is a fantastic example of an M4 Collimator sight with an equally nice leather M14 carry case. This sight was used on both the US 60mm and 81mm mortar systems. By laying the sight on aiming stakes, the mortar squad could fire indirect missions. The open sight allowed the squad to fire direct lay missions. A collimator sight is a type of optical sight that allows the user looking into it to see an illuminated