I initially set my gun up like that as well. I found that as a right hander, when the shotgun hung muzzle down it would roll outward and hang ejection port down. The sling and mount also added bulk to the side of the gun. In the end I went to an Zukov handgaurd with a IWC MLok QD limited rotation swivel as suggested by Aridus. The GGG mount is a really good low cost solution for a light but doesn't seam quite right for a sling. This is just my opinion though and in no way means it doesn't, or can't, work for you.