I wonder when that came in? I know my early (19)86AA prefixed rifles didn't have it, but I think the newest I had was a (19)90AA serial range and I cannot recall it.
I seen a couple of (19)93 rifles but I never examined them that closely, the whole a rifle is a rifle, is a rifle thing...
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Also, Michael, do you need a cleaning kit oil bottle? I have a bunch kicking around I think, some are shipped unfilled too if I remember right.