Tam tries to replace the sights on a Beretta PX4 Storm and discovers a quality control problem. Sounds like whatever program they use to generate the toolpaths from their CAD drawings didn’t quite get things right. That happens. But hey, that’s why you run one off and examine it closely before doing your production runs. I think Jason, when he was experimenting with making a one-off CNC AR-15 pistol and CNC 1911 (still in progress, pending Delorean engine rebuild), went through several mistakes before getting things right. The mistake is understandable, but selling the mistake is not.