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 Gray | Glock 17 G4 FDE | S&W M&P 22 | S&W M&P 45 | S&W M&P 9 | S&W M&P Shield 9 | Ruger GP100 4"
Sig P226 MK25 | Sig P229 Extreme | Sig P320 F | Sig P320 C | HK USP 9 | HK USP 45 | HK USP 45 (Tan) | HK VP9
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Mossberg 590A1 20" SP | Mossberg 500 Cruiser