No offense, but was I not clear enough in the OP?
I intend to to shoot everything that has already been shot by me, weird question really. I intend to acquire parts for the AR10 that my Armalite is, a true AR10 made by Armalite using the Armalite barrel that they installed at their factory and that I have already put 1,600 through, with their Armalite upper and lower receivers, that their Amalite BCG is riding in. I also intend to shoot my already shot by me over 2,000 rounds LR308 from JD Machine that uses a Nemo LR308 specific chambered barrel with a DPMS made BCG .
Maybe I did not make myself clear. I know what an AR10 is and isn't. I also know what an LR308 also is and isn't. I own both and want to buy spares for both. What I don't know is if I buy something like a complete bolt and not the carrier, or an assembled extractor, will they be okay for either or or what should I get for the AR10 and what should I get for the LR308? This is more than just asking about upper and lower fitments because an AR10 upper will not work with an LR308 lower and vice versa. I also know that if the headspace isn't tight then I will have accuracy issues and would like to avoid this. Criterion goes into detail if asked why it's important to not have an AR10 bolt on an LR308 chamber.
When they say AR308 style or AR10 in the descriptions, they can be a bit misleading and I have caught this before more than once. Such as when looking for a free float and saying AR10 yet it's more than plainly obvious that it's for a higher DPMS profile. So I am asking in hopes that maybe there are people on a large frame discussion board who would have the right answers possibly as I have exhausted my own problem solving right now.