WHATS BEST FOR Mossberg 500 C SHOT GUN? .SHOT GUN SCOPE OR DOT SIGHT FOR UNDER 130 YARD SHOTS? HAS RIFLED BARREL .ALSO WAS GOING TO PUT SCOPE MOUNT ON RECEIVER .HERD BARREL MOUNTS BETTER .GET NEW BARREL WITH MOUNT ON IT NOT ON RECEIVER.new to slug guns any help would be appreciated

The barrel mount will allow you to pull the barrel and maintain your zero. With that said if you use a red dot/holographic sight make sure you get one that is but for the recoil forces that are exerted with slug guns as its a lot more the your normal bird or buckshot. Personally I would get a 2-7 power scope that is built for slug guns as it will have longer eye relief to keep you from getting hit in the face. On a side note that gun is capable of shooting out to 250 yards with the right slugs if you decide to do so. Just be prepared to be spending 3-4 dollars for each slug as you can not shoot a rifled slug in a rifled barrel which will drive up ammo cost instantly.

Thanks

I had a red dot mounted on my Mossberg 500 (smooth bore) shooting the slugs many years ago. I mounted a rail on the receiver, and put a simple 4 moa red dot on it. It worked ok. Accuracy was not bad at 100 yards. My main complaint was the trigger pull. When you go from a bolt rifle to shooting a shotgun like a rifle, the trigger pull was very heavy. With a rifled barrel, accuracy should be better than the smooth bore. But it's doable.