Note to self open up gas a couple clicks before those lolDepending on which RnGs you want to get into...dump a bunch of water and sand or mud into the gun and see how it runs. Most of the bigger ones will make you crawl through that crap and/or go for a swim, or both. It's hard to appreciate something like the Legion RnG or others until you're chest deep in muddy water, then have to crawl through drain pipes and then end up fighting through your rifle on a stage, no matter how careful you might be or think your gun runs well.
Generally speaking, the guns running full power ammo, with full mass BCGs and gas systems not too tightened down run better.