Here’s a couple of paragraphs from a Washington Post article (paywall warning) on this. In their minds, the best reason to do this is to annoy or anger liberals.
“We have been building guns out of blocks for the last 30 years and wanted to flip the script to aggravate Mom,” Provo-based Culper Precision explained on its website. It went on to argue that personal defense is a right granted by God and that gun ownership is protected by the Constitution before getting to the most important reason the company was selling “BLOCK19,” as the design was named, for $549 to $765, depending on the specifics.
“There is a satisfaction that can ONLY be found in the shooting sports and this is just one small way to break the rhetoric from Anti-Gun folks and draw attention to the fact that the shooting sports are SUPER FUN!” the site proclaimed, exuding a bravado that would prove to be short-lived. “Here’s the thing. Guns are fun. Shooting is fun. 30 rounds full auto is fun.”