I've been outta the game for over 2 years now, but when I played, I had the gunsight for each country. For example, I used a German gunsight for German planes, and superfly.bmp for my American planes. I shot at least 20%. My gunnery was one of the best in the game, in my opinion. Personally, no, if you wait until D400-300 to shoot than it don't matter what gunsight you use.