Seems like a good deal. I feel like I heard good things about ac unity.
https://www.robertrtg.com/store/pc/20-PACK-GERMAN-MARKET-AC-AK47-40RD-MAGS-UNDER-5-EACH-4p9054.htm
https://www.robertrtg.com/store/pc/20-PACK-GERMAN-MARKET-AC-AK47-40RD-MAGS-UNDER-5-EACH-4p9054.htm