Short answer is yes, there can be differences even in forged lowers depending on brand. I have seen it in the ones i own.
Will try to go into more detail once i am home.
That said, if it from a reputable manufacturer you should be fine but you could run into headaches with small fitment issues. Again once i home ill go into better detail.
"I don't collect guns anymore, I stockpile weapons for ****ing war." Chuck P.
"Some days you eat the bacon, and other days the bacon eats you." SeriousStudent
"Don't complain when after killing scores of women and children in a mall, a group of well armed men who train to shoot people like you in the face show up to say hello." WillBrink
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