One thing i've just noticed, you have my fittings on the reg, which use 6mm hose, and an angel fitting on the gun, which uses 1/4" hose.
This setup won't work, they need to be the same type to use one size of hose.
And you can get my fittings a lot closer to the reg, by screwing the elbow adapter straight into the reg, rather than use the two straight adapters on there.