Brown Coat Tactical makes a really nice carrier that I've used on all my shotty's. I shifted away from the hard mounts quite a few years back, as the adhesive/velcro style are reasonably priced, work as well as most of the bolt on/plastic models. The most "durable" step up is the Aridus at 10x the price.
Advantages of velcro:
No receiver binding
Won't drop shells in the heat
Easily replaced
Cons:
Can be cut/torn
Could (conceivably) be torn off in use-HD use is not field operations, so not much of a concern.
Oof! That Aridus is nice, but a hunnert eighty bucks!