info on federal arms 30 round mag for ag42b rifle

[Riven_Cole]

rifle is also known as the ljungman i think, and is what the hakim (what i thought the magazine was for) is based on.
anyway i bought a 30 round aftermarket magazine for the ljungman by mistake, and i am wondering what it might be worth to see if i can recoup my losses. i spent about $45 on it.
any help would be appreciated

 

[Riven_Cole]

ok, how about this? i have read that with some fitting it may still work in a hakim. can anyone confirm before i start grinding at it?