Need help identifying a mag

[Royzo]

Bought a few rifles and this mag that came with them, fits none of them. It is marked 243 308 and no other markings of any kind. Any idea what kind of rifle this mag is for??? Almost looks like a browning mag, but not positive. Any help would be appreciated.
Darn, now I have to buy a rifle to fit the mag!!!!!!!!!!!

 

[evansd]

my guess is for Browning bbr, a bolt or bar with the little catch on front like my bbr and bar fits into floor plate looks more like my bar but don't have it handy to match up

 

[NL-Hunter]

With open bottom it looks like it would attach to a bottom plate.

 

[Royzo]

Thanks guys. Turns out it is for a browning bar.
Never had one before, so going to have to get one!!!!

 

[kamlooky]

Dat bee fur a Belgee'um BAR fur fifty Alexs........................

 

[gunrunner100]

Pre-93 BAR (Belgium/Portugal)