After some work, the Graingy aircraft company managed to turn the MkI XB-142 into something closer to a production bomber, although certain issues showed themselves, and not with the aircraft itself (the Graingy aircraft company does not find it their responsibility to elaborate on these issues). now with their customers bailing on the project, Graingy aircraft decided to continue the project to provide a heavy bomber for the factory defense force (little known fact about the Graingy aircraft company: most Graingy aircraft factories are located in one area, the island of Soia, defended by a defense force strong enough to defeat most countries, this is no secret but is not openly advertised since the Graingy aircraft company has no intent on aggressive activities). the XB-142 MkII does not come armed (except for a mini-gun in the nose) and needs to be armed after delivery. might be more info in comments