Does anyone have first hand knowledge of weber or not the triggertech ar diamond will work on a jp-15 lower receiver? Tried calling both companies but nobody answered.

They should accept most any trigger made for an AR.
From JP's site:
ReceiversFor anyone starting an AR build from the ground up, you can't go wrong with choosing high-quality components. Our stripped receivers are the very same ones used in our rifle builds, manufactured, machined and finished to our exacting standards. Both the forged JP-15 and billet CTR-02 models accept all standard Mil-spec components but rise above most any others on the market. Even our Mil-spec JP-15 receivers must face high reject rate attrition before we'll put our name on them.

That's what I'm thinking. Said they use.. 154" pins so I don't see why one wouldn't drop right in.