ar bolt lug wear

  1. freereload

    Gunsmithing Normal AR bolt wear?

    I recently built my first AR, and after a quick 40 rounds to break the barrel in, I took a look at my bolt and was wondering if this wear is normal? It's got 40 rounds through it and 2-300 hand-cyclings. I just wiped it off a little after shooting it. Thoughts? Any input is much appreciated...