A method of forming a composite rib for the barrel of a firearm is provided. The transmitter array includes at least a first transmitter and a second transmitter spatially separated from each other by a first known distance. A channel layer is provided between the source layer and the drain layer, the channel layer being made with a material having a channel band-gap and a channel mid-gap value, the channel layer having a channel Fermi-Level. Still further provided by the invention are methods for producing soybean plants by crossing the soybean variety D2011907 with itself or another soybean variety and plants produced by such methods.