My personal experience with a creedmoor build is that it can be sensitive to the loads and pressures generated with a rifle-length gas system--it is one of the few builds I've done which I feel really needs an adjustable gas block to make life easier. But that's just one build I've done--I don't know if other manufacturer's components avoid this. Accuracy when it's tuned right is better than any other x308 AR I've ever built or shot, so there is sort of a "reward factor" for the extra "frigging with the rigging."