Thanks for the pictures and comments, perhaps I should explain the reason for posting the question. I bought a M&P15ORC from Bud's because I couldn't find any M&P15 anywhere else, and because Bud's had a fair price on it. I live in SD where a compliant rifle isn't required. I don't care about it not having a flash suppressor or bayonet lug, the stock however is pinned in the extended position and I'll be wanting to change that when I finally get it. If unpinning the stock is difficult, or I want to change the stock completely, then removing the whole assembly would be necessary. I didn't know how difficult that might be if the castle nut was staked.

Tom, it looks like that bolt carrier should be fine.

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No. Not me. I'm in my prime.