MAA has finally changed their listing.
Now they're saying that the ATF has never officially stated which part they consider to be the piston. I would have thought that either tromix or one of the other manufacturers who have been selling pucks and listing them as the 922r countable part, would have got a determination before listing them as such.
There could be an awful lot of people running around with illegal shotguns right now. That sucks and is very irresponsible of those who sold them the pucks.
The vast majority of us try very hard to follow the letter of the law. I wonder what recourse someone would have against tromix et al, if they got jacked up over a 922r violation while using their product.
Here's MAA's revised product description
On AK's and on Saiga rifles, the steel shaft extending off of the bolt carrier is the gas piston. In the Russian American Armory factory manual, the puck-shaped disc located in the gas block is defined as the gas piston. ATF has not issued any special ruling on this. There has been no known disseminated ATF statements to indicate that the "puck" is not the piston.The TAPCO piston is made in the United States and if the traditional steel shaft extending off the bolt is determined to be the piston, the part will counts as 1 US part for 922r compliance.