Original Pre-WWII U.S. Navy Gun 3 Inch / 50 Caliber Dual Purpose Naval Gun Drill Round Dated 1921 M3 Grease Gun The 531st Bomb Squadron

The 531st Bomb Squadron

5" Finned Barrel

This is the more desirable leather washer handle version

in terms of half a dozen

A similar Short Rifle edition of this same weapon

Original Pre-WWII U.S. Navy Gun 3 Inch / 50 Caliber Dual Purpose Naval Gun Drill Round Dated 1921 M3 Grease Gun The 531st Bomb SquadronOriginal Item: Only One Available. This is a fantastic practice round that the USN used to drill with that fired a small rifle cartridge in the steel barrel that was in the brass casting. The rifle cartridge was much cheaper than firing a full size round. If you look at it closely it has a steel barrel inserted through the length of the shell. It most likely fired a 30 40 Krag cartridge. This drill round was designed for the U. S. Navy 3 in. 50