I have an Aero lower receiver that has a shelf that ends about halfway into the safety hole, as seen in the picture here.
It passes the 1/8 drill bit test, albeit barely (where it rests on the 1/8 drill bit is about as far back as it will go). With an upper receiver installed, the BCG binds up.
I know that dremeling the upper's "auto sear shelf" or whatever it is called, will fix this, but I have NUMEROUS uppers I want to use the SS on. I don't want to have to dremel all of them...
Would getting a lower that has a significantly lower shelf/the "M16 pocket" in the lower receiver fix this without having to dremel anything? And what brands would have that available? Aero is obviously a no-go for me now, but I've heard PSA, SOLGW, and Spike's are some of those