Can anyone ID the item in the photo?
Two holes on one side suggest it was on a display board at one time.
Provenance suggests possible Frankford Arsenal origin in the 1950s.
Cylindrical body is about 55mm (2 3/16") diameter by 1330mm ( 5 1/2") long with outer surface made of rolled aluminum sheet, not a drawn tube.
Small primer at the “base” end shows a firing pin mark.
The olive drab painted projection at the front attracts a magnet, and has a copper band at the lower end.
Entire object weight 19.6 ounces.
Anyone know or have any guesses? This will be donated for the IAA benefit auction eventually, but would like to figure out what is first.