Re: anyone seen this?
Several years ago, a company owned by Bill Akins came out with a similar device called the "Akins Accelerator" for the Ruger 10/22 platform. The concept was similar to the SSAR-15, but there were some notable differences. Atkins was selling them like hotwings for a lot of money. The ATF initially reviewed it and said it was legal since the rifles were inherently still semi-auto, as you were discharging only one round per trigger pull. After a second look a year or two later, the ATF decided that the part went against the "intent" of the NFA guidelines and declared the device to be illegal by ATF rulling 2006-02. Everyone that had one had to remove the mainspring from the device and surrender it to the ATF, or else some other way discard the stock in an appropriate manner to avoid prosecution for possessing a post-1986 automatic firearm. If I remember correctly, Akins was forced to buy many of the stocks back from the customers in order to avoid lawsuits. They subsequently dissolved into obscurity.
My point? Give it another year and it'll be illegal to possess. Great way to waste some money though.