Iron sights on WWII rifles...ha ha! Mike Venturino penned an article within the last year or two in which he makes mention of the sights found on the bolt guns of that conflict. Simply put, he humourously figured armies of the time didn't want to hurt each other, given how hard it was to use the sights. But, to get back to your rifle, it's quite the flame thrower with the right ammo. Enjoy.
Oddly enough the flash didn't bother me. After a while, the weight of the rifle started to get annoying. I had difficulty holding the sights on target standing up. If you look at my pic, the flyers are the ones when I was standing up. The tight groupings are when I was bench resting.