You do realize that regulated 12g canisters still aren't that consistent anyway? One it is past the regulators, it is still subject to temperature and other environmental factors. Just wrap the HPA line around your sling and in a little pouch and you'll probably never notice it. The problem isn't that it is a bad set up, but would never be as consistent which is needed with a sniper's rifle. The whole point with two regulators is moot as a few people I know run dual reg set ups on HPA rigs. Also, it's not the matter of it affecting consistency too much, it's the fact it affects it all. Most shots will vary from one to another, never giving you an exact idea of where the shot is going.