Hi - could tell me what optics you've tried on your M2 slug gun, I don't like the huge front vertical white line/sight, blocks too much target. I've got a Holoson HS510C reflex red dot coming to try and might get the Holoson 3x magnifier to go w/it. I know you're not supposed to add too much scope weight or the inertia recoil won't work correctly. Thanks in advance for any advice.