I added one up near the muzzle on mine, after trying the original one in various positions. Moving the original one around resulted in POI shifts for me, as the pressure tube shortens when the pressure drops, and also because the design depends on that clamp, in its original position, to help keep the receiver in positon on the pressure tube. I found, after adding the new one near the muzzle, that it worked best if I left out the set-screw that clamps it to the barrel. If it clamped to both the the pressure tube and barrel, I got POI shifts as the pressure in the tube dropped. Someone offers a front clamp that is grooved for an o-ring around the barrel, to let the pressure tube move freely. My Marauder has a front band like that.
I wanted a front band to keep the barrel from getting knocked around, not to keep it clamped. So leaving out the top set-screw worked for me.
Dale