The baritone saxophone, often called "bari sax" (to avoid confusion with the baritone horn, which is often referred to simply as "baritone"), is one of the larger and lower pitched members of the saxophone family. It was invented by Adolphe Sax.
XR-5000 "The Equinox" Heavy Submachinegun
This odd weapon uses a helical mag-fed system which can be chambered to house the .45, .357, .44 and .50 AE. This model shown uses the .44 and has a 50 round mag (double stacked). It was designed to be both fired from the hip and the shoulder as well as to be optionally ambidextorous. Was used worldwide until it was replaced by the XR-5001 which came with an integrated bi-pod and a longer barrel.
Got my inspiration from my bari-sax, believe it or not.
Credit to Badenian for the compensator.
Horns
Back in the day, I used to play bari sax. Having the gig open with a bari sax honking, literally honking what might've been a bottom Bb (I've not got the ear anymore...) was amazing!