edit: So really easy option #1 is use a bottom line regulator. I have LP tanks, I have a maxflo that needs recondition but that a "be happy it works" kinda option.
Easy Option # 2 is the ACP adapter for a standard reg. Still a good look for the AMG IMO. Some of my favorite spyders used this very setup.
So the last option is to make the forgrip a regulator.
I don't see this as the easy or cheapest option. I'm not sure if anybody has even bothered to go for this try nor am I sure I will want to.
Now this is just me playing with parts, sizing them up looking to see how they could work with each other.
Basically I'm thinking maybe the torpedo reg internal can be made to fit. I feel could be easy enough to have a new center nipple section longer and made to fit the necessary pieces to make a regulator function. I might just pick up a dye or cp and possibly put together something that works.
triple edit by now?: Looking at a CP V2 inline. Since the V2 is a 2 piece inline with the hpr coming through the bottom this might be a good bet.
-Have a disk make for the piston seat to fit, use 1 maybe 2 orings around it and have holes drilled around it similar to the lower CP section so that air may pass by. Use the adjustment screw to hold it in place, possibly through both sides if 1 wont due.
-The V2 uses a shim of sorts to act as the middle piece to help separate the piston from the hpa from entering, its possible this may fit and either a new foregrip entirely machined or just this piece.
-the piston and spring(pack?) would then fit inbetween the v2 shim to be capped by the amg nipple disk and the whole thing is still clamped together from the factory bolts that pass through the forgrip.
ideas? I may just order a V2 soon now.