MSR Pistol Designation In Doubt?

[StoneHendge]

Big picture is with the ATF acting like it does and what the law says about SBRs, manufacturers and consumers took risks producing and buying these braces. I personally have shied away from them because of that. I hesitate to say it on a public forum, but I doubt anyone could truthfully say the Grendel pistols they built weren't designed by themselves to be shouldered with an "arm brace". I know what I see when I see people shooting pistols at the range.

Edit add: Also, remember that the Dayton shooter used a pistol. No one in the public probably knows, but perhaps he was shouldering it. Which could lead to interagency politics.....