Which does the Vile Horde like best?

[Klem]

Although - apparently a couple of pcs of wood and some wood clamps will work too....
https://www.ar15.com/forums/AR-15/-ARCHI...1#i7871808

Two blocks of wood make for a great clamp, but I'd sooner sandwich the barrel with them than the receiver. Obviously you bring them together first and drill a hole slightly smaller than the barrel to be able to grip with max surface area in contact.