I had the Johnson but it has to much recoil for my old hands and eyes. I don’t have anything I really use that is BR IV since I try and keep things between the 1-3, 3-5 and 5. My 1-3 are all BR2 weapons. My 3-5 are all BR3 weapons. For my German squad I use the 4 Beretta semi auto’s I got from BP and they are BR1 and I use these in my BR 1-3 matches, which is why I wish I could at least get a couple more. They don’t have a lot of hitting power, but barely any recoil and they shoot as fast as I can click my mouse and still be very accurate. 3-5 levels I use the BAR A2 and even carry it as a backup weapon to my Brownings in level 5 instead of carrying extra ammo. If I went back, I would probably change it to carry extra ammo, but I am to lazy to change it and spend gold doing so. 
I mainly stick to weapons that have some what low recoil since I am not as good with the higher recoil weapons.