Notice that the heads of the originals are completely uniform, while the repros are totally random - probably Chinese s**t.

And, aside from honest wear, many originals will show mushrooming from long periods of time rattling in a stock.

Oilers are common, but muzzle covers are probably one of the hottest items around - used to be a $10 item, now they bring much more. Glad I bought mine early - couldn't afford to equip my rifles today.