Leather carring case?

Hello, I found this web site in the Grand Association Journal. I am trying to find out what this leather carring case is. It is 4x4/5x6 inches with a flip top lid, stamped on the front is D29377 case, carrying M14. On the inside the mfg. stamp is Milwalkee Saddlery co. It mounts on a web belt and also has a carrying handle and has ventilation holes in it. Any ideas?? Thanks, John Nixon
jnixon@texas.net

WWII vintage original CARRYING CASE M14 that is made of heavy leather. measures 4 inches by 4 inches by 6 inches tall ,excellant original condition with some light verdigris on fittings. brass belt attachment with brass loops on the sides. snap marked KLIKIT PULL with case marked D29377 CARRYING CASE M14 which makes this a carrying case for a 60mm mortar sight. condition on this is as nice as i have seen on WWII military gear.

picture here WWII M14 60mm mortar sight leather carrying case D29377