It's a factory Bushmaster upper and barrel. 1/9 twist, 4150 steel, 5.56mm chamber, chome lined.
I'm located in Beaverton, OR.
I'll accept Paypal +3%, MO, or cashiers checks (or cash if it's in person).
To my knowledge, no FFL is required for the launcher as it isn't technically a gun - I got it without an FFL. You might want to double check your state and local laws just to be sure. 37mm.com has a legal section and the only local laws I saw there were limitations on flares for SD, Minnesota and Massachusets. The launchers barrel is steel.