I don't exactly have an issue.... yet. Was cleaning my SA20 and noticed on the bolt a sizeable "pit" (about the size of a pinhead) on the face of one of the locking lugs. It got me to thinking, "if this becomes a bigger issue ie. a crack appears and/or the lug breaks off, who do I contact?"
FWIW, the rifle has exactly 400 rounds through it, and it's all been Federal 5.56 NATO XM193 55GR.