Fletcher pushed back again, responding that from the wake on the Las Vegas taking pictures it “would've been irresponsible for your ATF to not” revisit its previously interpretation of the definition of machine gun, and to revise it if it concluded that it was incorrect. The Stokes mortar (earlier mentioned) https://machguns.com/product/lot-1460-military-armament-corporation-m10a1-smg-silencer-class-iii-nfa/