Just wanted to get some other opinions, as I am having a hard time finding these with ANY round indentations in them. No disrespect to the 2 I have asked (you know who you are ), just don't want to bother anyone, and don't mind if I look like a loser with what might be a very simple answer or obvious that it "just works" anyways. Have noticed on 3 lower receivers that I have (2 Stag's and one LMT) that the stock end plates are oval, while the indentation that they go into on the receiver is circular. Any of you know why this is, if it's normal, etc? Don't know why I've never noticed this before, and the only round ones I can find are considered for fixed stocks. (the difference appears to be the little piece that protrudes on the end plate that comes up which keeps the buffer tube in place) picture here for reference of what I am looking at (the end-plates like I have): EDIT: you can kinda see in this picture how the end plate has a little gap at the bottom (because the plate indentation is oval yet the receiver is round) where the take-down detent spring gets pushed in: If I didn't explain this well enough, let me know and I can try better.