I have an Empire Trracer with a backbottle. I'm running it for shooting First Strikes, so it spends a lot of time in my harness. I was wondering if it loses air while it does that? I think it does, but I'm not positive. I was thinking about getting an On/Off ASA so I could turn the air off while it's just sitting there. Unfortunately, I can only find ones that hook into a bottomline. Are there any that can go straight from bottle to the gun?