I have built a custom 416 Rigby based on a BRNO ZKK 602 action and a Lothar Walther barrel. I used a custom mag box and bottom metal that holds 4 rounds. The action has the pop-up peep-site and I fitted a 3- position safety catch as well as many other custom options.
It has a Swarovski 1.5-6 x 42 scope in Talley detachable bases.
I am very happy with the results but I can tell you it wasn’t a cheap exercise!