I disagree. I would say that this is not a private label marker; more likely it some machinists toy.
Adjustable LPR's didnt become "mandatory" until the early 2000's.
the milling is legit, but again nothing a machinist student couldn't handle.
The Air Assist does not automatically make it an adrenaline angel. I remember Adrenaline used to "Adrenalize" stock WDP angels back when they were in business. Nowadays if you wanted air assist on say, an LCD, you would just need the Adrenaline solenoid manifold plate and some low pressure tubing.
this would be a superb LED if it had a single trigger frame on it. Just more age appropriate.