Does anyone have a counter pressure fill gun/system that they use to fill growlers from the faucet of their kegerator? I've been looking a few options, but it seems like most of the guns should be hooked up before the faucet, not after it. One place I get fills uses the Blichmann gun hooked directly up to the draft system, and those fills stay fresh longer than another place that flushes the air out with a separate tube and tanks, then uses a faucet tube to fill. I'm looking to fill growlers from my kegerator easily and occasionally and buying a separate CO2 bottle.
I've got a hose spout for my Ventmatics, but I've never used it. I simply jam a suitable diameter hose on the standard spout. I use the Beer Gun for bottles.
You won't be able to really counter pressure fill from the tap. Your best chance is to buy a cp filler and do it from the keg. Or do like you said. Blichmann beer gun. I use one to fill directly from the keg and it works great. Purged the growlers and bottles and fills with no foam.