Now that’s a franken-gun! What I can tell/best guesses:
Remington Model 11 receiver turned upside down.
Custom ammo tube extension. Seems to be custom built for this gun, especially with the front sight added to it. I’m pretty sure it’s not a commercial purpose-built component for the Model 11.
That grip comes from an MG 42 or MG 3.
That looks an awful lot like an older Galil folding stock (not quite sure though).
My best guess is, that the lower handguard is original Model 11, just relocated/modified.
The upper handguard does not seem to be liberated from any gun, but purpose-kludged for this franken-gun.
No idea where the front and rear sight come from (not from a Model 11). The front sight with its protector wings looks awfully reminiscent of … I can’t put my finger on it. I know I’ve seen it before …
I think it might actually work. It’s definitely confusing at first but I don’t see any reason you couldn’t modify these parts like this to create a top tubed semiautomatic shotgun. There’s also not much (or any?) on the market in that category, so that’d explain the why part.
Now that’s a franken-gun! What I can tell/best guesses:
That gun, if it works, looks like a lot of fun.
I think it might actually work. It’s definitely confusing at first but I don’t see any reason you couldn’t modify these parts like this to create a top tubed semiautomatic shotgun. There’s also not much (or any?) on the market in that category, so that’d explain the why part.