Agree with an earlier poster, button on site is to remove bead, just press down and push bead. Rear sight is interesting, not sure why you'd replace the standard Brno sight with a single leaf that looks a bit manky.

The stock looks nice and yep, the standard trigger can be a pain to get right but is ok when a good smith sorts this. Standard they can be a bit creepy and heavy and obviously these are not adjustable by us at home (unless you're very good and mechanically minded). A good smith can do ok on them though (with some effort).

Just out of curiosity what does the thing weigh, normally a pitfall with Brno can be the 9.5 bare weight for the 375H&H because of that Magnum action and big heavy barrel. Put a decent scope on it and it can go 10 lbs - 10.5 lbs. Thats to heavy in my mind for Hollands finest.

Conversely the big magnum with the 25 inch barrel can push 300 grainers out at 2700 fps and whilst this velocity is probably counter productive when your using the thing as a DGR, it's very handy with the 300 grain Sierra boat tail as a long range big deer and african plains game load. Food for thought there I suspect.