A while back I was watching a bunch of videos on all things NV and one of the subjects was how setup a dedicated NV gun. One of the guys, not 100% sure but I think it Chuck Pressburg, made a comment to the effect that the majority of handguards were not rigid enough to trust while using a laser due to POA/POI shift. Basically that everything but a Geissele, with its long barrel nut and hell stout construction, was shit for this purpose. Now I get that a drop-in style like the old KAC RAS is probably not a very good option, but wonder how big of a deal is really with todays quality offering.

So my question is Which handguards are suitably rigid enough for active aiming with a laser? It seems to me that a Wedgelock or URX4 would be just a rigid as a Geissele maybe more so. What about M-LOK vs Picatinny? Seems like Picatinny, with its increased mass would be stouter than an M-LOK, say a BCM MCMR13 vs a QRF12? Anyone have a lead on tests on this subject?