Been around shotguns a long time, but never heard of that one.
Also, when the bbls are shortened, oft the patterns drift apart. This may or may not be deletrious for your purposes.
Unless you've 30" bbls or more, why shorten it? Lay that untouched piece down next to a riot bbled pump, they're close to the same now...
And extremely short shotguns are not all that crucial for HD, unless you're 4'6" and built like Tinker Bell(G)...