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Your lower should fit well with your upper. Some don't fit and so people will stick accuwedges and whatnot in their to firm up the fit. More expensive lowers match their expensive uppers for fit. Zero wiggle increases the accuracy potential.
AR15's are Lego for men and women. Lol. Lancer has a magwell you can add. But if you want one machined in, well I don't know. The atrs modern varmint has a big well that's part of the machining. They don't sell them separate though, so that's no help here.