saw it on TV or a magazine recently.......dont know if it would help or have adverse affects......a barrel is a harmonic device and should vibrate freely......thats why you freefloat barrels.....make sure theres NOTHING touching them at any point...... and dont rest your barrel on anything when shooting.........i dont know if a rubber ring around it would effect the accuracy or help it.......be interesting......thinking about it....i can see both points........the rubber would absorb any vibrations.....but hmmmm interesting......hope a few guys get them and play with them......i honestly dont have rifles worth trying them on....