Fits like a glove - Magpul Industries SGA Forward Sling Mnt, Rem 870 MAG508

Awesome product, fits my Mossberg 500 with ease. No problem installing and no problem with scratching your shotgun. I recommend this product for those that need/want a sling mount on your shotgun barrel. I would recommend though using a push button sling vs the sling attachment that already comes with the item, but that is more or less a personal preference. Other than that, the product is definitely worth it.