I hated those red lines and triangles all over the SPAS-12's receiver, so I removed them! I included an alternate version that keeps a few of the red trims and the red Volstrom Arms Ltd. branding. See the screenshots above for comparisons.

This works perfectly fine with the vanilla SPAS-12, but my screenshots show it with Mal0's lovely folded stock mod which you can find here.

I've also added an optional mod to increase the SPAS-12's tube capacity from a measly 5 shells to 8 like it is irl (and how large the tube model appears to be). I've also bumped up the total ammo capacity so that you can hold 64 shells total (7 full extra reloads). Hopefully this makes the SPAS-12 a little more appealing to equip. It's not as strong as the Street Sweeper but now holds 22 shells more.

For now I've removed the optional ammo increase, it was breaking the game. :(