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What crack? The top from 1 o'clock to 3 is the extractor groove. The ridge at 7 is also supposed to be there, not sure what it is though. They seem to all have that.
Not an expert, but pretty sure those look far too clean to be "cracks". Probably supposed to be there, but like I said before, never really seen one before.
My butt has a crack in it, so i sent it back! Marstar has some nice SVT's. The one I got from them has a mirror like bore and a near mint AVT stock. I was really impressed with mine.
Ahhhhhh I just bought two about a month and a half ago because I know they are going to be jumping in price soon, seeing these photos makes me want to go buy another two!!!! Haha