Yes, that IS a tough one.

If backed into a corner, I'd have to probably say the HW77 as a model. And, relating to guns I own, I suppose that would be my early .177 Mark I, later morphing into a Venom Vantage by the mid-80s, complete with Venom muzzle brake and cocking lever grip & wearing its Tasco AG 2-7x32. Last serviced by Steve Pope February 2017.