I don't understand what you are asking. The image you posted is of a stock magazine. If yours is cracked or broken along that ridge that you have circled than I would say you have a problem.
If yours looks like the one in the picture..... it's supposed to.
Glock 19 G4 BFG | Glock 17 G4 FDE | S&W M&P 22 | Ruger GP100 4" | Sig P226 MK25 | Sig P320C 9mm | HK USP 9 | HK USP 45 (Tan) | HK P2000 9mm | HK P30L 9mm | Walther PPQ 9
Daniel Defense DDM4 V4 | Arsenal SGL 21 | ASA Side-Charger SBR | Savage Mark II FV-SR
Mossberg 590A1 20" SP | Mossberg 500 Cruiser