ID 20MM Shell?

20 MM shell…
Trainer, as projectile is one piece to casing, casing is drilled with holes…
Markings are on head stamp…
“20MM MK2 1943”, with little L like symbol in diamond.
Side of brass part of projectile tip, flat, not pointed.
"MKXXI MOD…MB60 LOT"
At least it looks like that…Any idea? US? Weapon?
Thankyou, Andy

Andy

Sounds like a plain vanilla 20 mm Oerlikon. The “brass part” is the fuze. There were several recent threads on 20mm Dummy and/or Drill rounds that you might want to look at.

Ray