AGT Vulcan 3

Do you know where it is leaking from?

If it is not clear try takin gall air out. Then take out the plenum and see if the regulator is in the front or in the rear.

If it is in the front, then the external o'ring of the regulator can be damaged. Just change them for new ones and Lubricante them with silicone grease. Put the regulator in the rear with the piece of tube at the very rear.

Reassamble, tight the degasing aleen screw and fill again in order to see if it do not leak anymore.

My Vulcan 3 700 mm 30 Cal damage the external o'rings of the regulator if I put in in the front (for large plenum).
 
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My Vulcan 3 hold its air just fine,,,, slightly modified on that side as it now have a FX carbon bottle, so i do not loose the air in that degassing it.

I would be interested in buying a O-ring kit for the Vulcan 3, but never seen one.

Funny thing though, lase i messed with the V3 a 3 mm steel ball came out of it ( rear end ) but thanks to no drawings of the damn thing i have no idea where it go, mind you the rifle function just fine.