Gun issues aside, [Justin]’s been CNC milling his own gun parts for quite a while. We’ve been a fan of his work simply because of the technical challenge that this sort of milling presents.

In operation, the UNISIG R-4-2-2 production cell uses a smart conveyor to load four barrel blanks simultaneously into a UNI four-spindle gun-drilling machine. Drawing from a bulk feeder, this ...