This is kinda interesting: CampCo, a company that is not expressly a toy manufacturer (from a cursory glance, they seem to sell all manner of licensed products such as pens, wallets, watches, for various outdoor, firearms, and automobile companies, among others) has released a “building block” — essentially a LEGO clone, if more in line with the Technic series — shotgun set. Seemingly inspired somewhat by the 870 Witness Protection model, or the more recent 870 Tac-14, this kit allows you to build your own model Pistol Grip Shotgun with Remington branding. Aside from being visually impressive, the pump-action is fully-functional, capable of loading and ejecting the included six model shells, and it also comes with an attachable red dot sight. Alas, no Remington 870 bayonet lug.
If you have a Scheels near you, you might find this in their toy department; that’s where I found it out in the wild, along with the Model 700-inspired sniper rifle. Otherwise, you can order directly from the CampCo website via the link below.