question about the Vltor VIS

[RAM Engineer]

Is there anything that keeps the VIS barrel nut from rotating other than torque/tension? No anti-rotation device?

[Mr.Goodtimes]

i believe its a monolithic rail system, so it mounts to the upper reviever as well and bolts on there, thus there will be no movement at all.

[RAM Engineer]

I'm talking about the barrel nut. The barrel is attached to the VIS with a barrel nut. What prevents the nut from rotating, other than tension?

[militarymoron]

the proper torque keeps it from rotating. with the VIS you can torque it to the right value because you don't have to line up a notch with the gas tube (sometimes resulting in under or over torquing).