Looks like Remington decided to make the competitor of the Mossberg Shockwave shotgun. But Remington 870 Tac-14 don’t need adapters to accept short shotshells.
Banshee posted new photos and iformation about his short barreled shotgun on Remington 870 Forum:
Sure no problem. I haven’t made any new pictures, so these are all old.
The shotgun started out as a Wingmaster Police trade in with a Mossberg replacement barrel that I picked up for $149.00. So, no nice 870 was harmed in this transformation.