Recently bought a Benjamin Marauder in 22 caliber. Enjoying that 'click - pftt - splat' of shooting paper at 50 yards from a bench. Didn't care for shooting three magazines then I'm donefor the day though. Have a small Vezor (SP?) compressor suitable for just filling the rifle. I could clip it onto my car's battery but not crazy about the idea. Saw pics of tethered bottles and guns. So I'm thinking a 3 liter bottle, but would take forever to fill using fill - stop for 20 mins - fill- stop..etc. Then I remembered ..my neighbor runs a paintbal shop. "Hey TJ, how filling up an air tank for me ? Sure we got a few guys that do it.. Show me your rifle. Yup that would work." Showed him the 6.8L set up on Amazon, including regulator. "Yup that would work". Ordered, filled tank to 4500 psi, range day. Shoot a couple of mags, top off, reload mags, shoot, top off. 100 pellets down range. Life is good!!!