That's one of the "greeblies". When my kit arrived, the "u-bend" for the stock was broein in transit (a lot can happen coming across the pond). They sent me a new on, but while I was waithing i took care of everything else. I ordered the full resin kit when I contacted them about the part, and they shipped them together. They arrived yesterday, and the first coat of primer is drying on the stock as I type tis. I should have it on there by Monday...