I'm not a collector, just someone who loves firearms and loves to put rounds down range. I'm wondering how so many folks when they list their weapons for sale have what seems to be fairly accurate round counts. If I think about my AR (unlike so many here I just have one lowly AR and a pittance of just 10 or so firearms - I feel so inadequate ) I couldn't tell you how many rounds I've put through it. Even on my seldom fired weapons I could maybe guess but it would only be a guess.