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Sub calibre 4 barrel 4 Panoramic sights- ?????????

It's a WWII U.S. M3 field artillery sub-caliber trainer. It fired a 1" diameter steel ball as far as 85 yards by compressed air or a blank cartridge. I don't see any lines for air so I think these are the cartridge types. There are 4 separate units in the photo, bolted down side by side. These were used to train artillery gunners the basics of azimuth and elevation and other factors of firing artillery. Take a look at this video....

[video=youtube;B3ah9nFAbdg]http://www.youtube.com/watch?v=B3ah9nFAbdg[/video]
 
"These were used to train artillery gunners the basics of azimuth and elevation and other factors of firing artillery."

Possibly but doesn't seem very likely, you don't need to fire to do that. Layer training is done on the gun itself. The bank of 4 is an obvious clue to their use. Training forward observation officers in the basics of observation and adjustment of fire, a more modern equivalent is the 14.5mm trainer mounted on a tripod and with a range or 1000-1500m or so.
 
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