3 on the magazine

the 5 might be S for savage which would make it a No4 mag like the right one in the pic above

thanks! again, much help! it does make sense, the number 4 is a savage after all.

Sounds to me like the guy simply switched his magazines around without realizing it. At least you won't have to buy any magazines now. Compare them side from side, you will never get them confused again I bet.

I love it when things work out and gun parts get where they belong!