Help me identify this strange magazine - pistol caliber

[triggerman770]

magazine

Glock has a 33 round stick mag for the G-18, looks kinda like that

 

[leadcounsel]

Bump

 

[RickB]

Since you don't know what it's for, how will you know when you receive a correct answer?

 

[leadcounsel]

I can compare it to online pictures of suggested magazines. So far it has not matched any suggested mags.

 

[CowTowner]

Just had a look at one of my 9mm Uzi mags. Could it possibly be a .41 AE mag for an Uzi?

 

[leadcounsel]

Thank you for all the responses.