So, I came across this a few days ago, and I am rather interested in it's strange and unique design. This suggestion, of course, is for the Gilboa DBR Snake or just "Gilboa Snake" for short. A modified AR-15 with two triggers, two barrels, and two magazines along with a unique recoil system that cuts down the recoil of blasting away with two 556 rounds at once effectively for controllable fire. Yet, this civilian variant was born of a crazier idea to have two rounds fired at once from one gun per trigger pull. Proposed stats are below, though some stats may be taken or modified from the HK416 and other ARs or DMRs.
Name: Gilboa Snake
Caliber: 5.56 NATO (5.56x45mm)
Capacity: 60+2 (one in the chamber per barrel)
Reserve ammo: 120 rounds
Fire modes: Semi single, double-semi (either 1 pew per trigger pull or two at once for 1.5x recoil)
Velocity: 1000 Stud/s
Just because it's firing (effectively) two AR-15s at once does not mean the ROF gets doubled. It is doubled. But RPM stays effectively the same.
Damage: 35 -> 25 (Or 35x2 -> 25x2 when using "double semi" firing mode)
Range: 70 max -> 150 min
Head Mult. 1.5x
Torso Mult. 1.3x
Limb Mult. 1.0x
Penetration: 1.0 studs
Recoil should be effectively around that of the SL-8, with the multiplier of 1.5x for the double firing mode. As a note, when selecting the double fire mode there won't be an animation to change the selector as instead it's two trigger pulls at once.
Milspec Single Trigger-
Modifies the gas system and trigger group to return the model to it's original mil-spec form. Double-semi (like the Stevens DB burst fire) only, but now every single trigger pull launches two rounds at the expense of a bit more recoil (1.3x that of the unmodified semi-auto mode). Penetration increased from 1.0 studs to 1.5 studs. Damage is now 30x2 -> 20x2 while preserving range.
Folds the stock. Cool. Stats are unaffected. This is more cosmetic, really.
Mods that won't work on this gun:
Suppressors. They would either cover up one barrel or be rendered ineffective by the double-barrel setup. Ditto for muzzle brakes, unless one wants to make a completely different model based around what's shown in the images below.
Weird animation quirks:
Due to the weapon being two AR-15s side by side with the ejection ports being on both sides, the cartridges are ejected based on which barrel is being used. Ejects to the left when the left barrel is used, ejects to the right when the right barrel is used. Mil-spec was intended to fire from one barrel, then another, though it was not actually described which barrel fired first. Not that it matters, since the difference in when the cases were ejected (after being spent) is down to the millisecond.