I was at the field today and I was talking to a guy on my team who was also shooting a mag. I noticed that his 45 grip had a built on bottom line (not bolted on), the air ran through the inside of the grip, and a quick connect nipple came out right under the velocity adjuster. A small braided hose clipped on and the went around the side of the gun and into the regulator. It was pretty neat and is the only one like that I have ever seen. Anyone know who made these?