...yes, thats a standard 870, permanently custom modified (end of the rcvr milled off to square) to exclusively function as a defensive bullpup.
FCG has also been tuned, and the forcing cone recut for tighter shot cloud.
A series of simple, but precise "bolt-on" milled aluminum parts attaching to the rcvr (and are removeable with torx screws), said plates and rcvr all bear directly on buttstock, so no fasteners take any stress during firing.
EOtech, shotshell tote, and pistol flashlight added--the flashlight does double duty as the front sight post just fine, so frankly no irons are needed.
Weighs about 10 pounds. Very stable and intuitively ideal for tracking moving targets, day or night. Recoil is straight back down the stock, so there is no muzzle climb on firing.
Steel barrel shroud serves as barrel armor, and integral muzzle cut outs are nice and sharp, and serve as a "muzzle anchor" (in doorframe or for "close contact"). Shroud also is tooled to receive steel mounting blocks for the usual accessories.
It ambidextrous, and balances on the pistol grip, and is fully capable of operation in one hand in single shot mode of course.
Also a very compact package.
Loading, aiming and shooting, are all very consistent, and very fast.
Very, very fast.
The flashlight is operated by the toggle switch on the back of the light, and the front handguard is not sleeved, so you just reach up with your front thumb and finger and flick the light on, aquire, check, fire and release. In darkness it is like a bolt of lightning.
Trigger is just an actuator that operates on an isolated transfer bar acting on the original 870 fire controls, which are tuned for proper fit, but unmodified in function. Crisp, clean and consistent every time.
Since this is a pump action SG, and is intended as a bona fide defensive firearm (as distinct from a "club"), the factory "safety switch" is therefore superfluous, so it is left as is, but abandoned (locked out by coverplates in the failsafe "fire" position).
For liability protection, the barrel is actually a bit longer than factory built, at about 18 and one half of one inches; overall length is just under 27 inches, less the buttplate assembly, thus guarding against a malicious enforcer removing the buttstock or rubber pad assy to generate violation, even so, it would still measures over 26 inches overall with the buttstock removed and thrfr in full compliance with no way to "game it" to the contrary.