How well do those front rails actually mount?
My front heat shield is pretty loose with just the spring clamp holding it on. Do the setscrews used on railed fore ends hold well enough that you can hold a real zero?
The rail on mine has held steady for a couple hundred rounds now; the allen screws pull two steel U-straps up agains the barrel from the underneath, and a thumbscrew tightens the rail into the receiver. Seems pretty solid.