The engraving references Rep. Joe Wilson's (R-SC) outburst during President Barack Obama's health care speech to Congress in 2009.
Palmetto State Armory is selling the gun parts to "honor our esteemed congressman Joe Wilson," according to the company's website. "Only 999 of these will be produced, get yours before they are gone!"
At the bottom of the page, the company acknowledges that the product is "neither endorsed nor affiliated with Joe Wilson or his campaign."
Palmetto State Armory president Jamin McCallum told the Free Times his heart goes out to the victims in Arizona, but did not comment on how and when the idea for the "you lie" part came up. Palmetto State Armory did not immediately respond to TPM's request for comment.
The gun parts are made for the AR-15 semi-automatic rifle. The lower receiver is technically the "firearm" component of the gun, and it's needed to make the gun operate. It also houses the gun's serial number.