It’s really only can hold 6 shells for right hand shooters. The mount is attached with velcro, and I assume you could buy double sided 3M to improve on durability. Who are we kidding though, it’s super cheap and the metal quality of the part is great for the price. There is no doubt in my minds the shells will stay in place. Now my tactical shotgun looks like the shotgun John Wick used in chapter 3. Would recommend