I'm in the middle of a 308 gas build and have seen so many pics of folks running cantilever so I've been trying to figure out if it's worth trying.for my AR-15's, I use cantilevers with as short of a cantilever as possible, like the Geissele or ADM Recon. For my AR-10's, I use non-cantilever mounts like the ADM Recon-S. The Recon-S is a straight up mount. The upper-receiver pic-rail length of the AR-10 is long enough that you don't need the cantilever length, at least for me, unless I guess if you shoot nose-to-charging-handle ("NOTCH").
No, its perfectly rigid for its use.cantilever is not as rigid as a straight-up mount, due to that cantilever arm hanging out the front without direct support.
What mounts are you looking at? Cheap mounts can really give you issues.I'm in the middle of a 308 gas build and have seen so many pics of folks running cantilever so I've been trying to figure out if it's worth trying.