While you are on the site, in your browser find and click "Add to Home Screen" A CGN beaver app icon will then be created to your phone that is directly link to the site.
Note: This feature may not be available in some browsers.
Removing the pinned portion of the rear sight is straight forwards. Don't attempt to remove the pin! Just hold the rifle in one hand and press with the thumb of that hand over the 200m mark. While pushing down hard, use your other hand to pull back on the sight leaf.
Basically there is a vertical slot that houses the pin that you can see from the outside. The slot is open at the bottom which allows the pin out of the slot. The leaf spring retains the pin in its slot while forcing it up.
I haven't really played around with the 452, but the first rifle I bought was a 455. Got the trigger kit from YoDave. Action is smooth, fit and finish is excellent. I'm on 4000 round or so, and accuracy is still superb.