so here is a suggetion with a layout of stats.
HEAVY COMBAT RIFLE
name: HCR-76.
concept base
![Image](https://s-media-cache-ak0.pinimg.com/originals/15/37/51/1537510ef7f6720f72c6b0120a446785.jpg)
fnherstal.com/typo3temp/pics/fd2e9a9ef4.jpg
blackopsdefense.com/wp-content/uploads/2015/01/fn_f2000_fs2000_eglm.png
info: the HCR is a heavy weapons platform designed so that any soldier can use it, what it lacks in aim and ammo, it more then makes up for with its grenade launcher and boosted damage.
stats(t1)
damage: 5 (4-6)
pierce: 1
ammo: 2
fire rate: full auto so displays 10 rounds per burst.
aim: -15
special: 40mm
best at: 8 range. (highest range stat is at 8, with it being worse at close or long range.)
special info
tactical grenade: launches a single 40mm grenade, 2 charges.
range: 12
damage: 4
blast range: 1.5 (think that is the number for the frost grenade might have to look)
attack action: no, can fire this then attack.
cool down: 2 turns.
reason for the idea: xcom lacks in the heavy assault weapon department, we have the cannon but that is well a cannon, it is great for supressing and dishing out bullets but it is not something you would give to every class. the idea behind the heavy assault rifle is for a weapon that any class can use, and while yes it does more damage and has an under barrel special it comes at a cost of lower aim and ammo.
EDIT: a note, I know sort of how to make this by modding a weapon config file off of the steam workshop, but that is only the base stats, so no idea how to make a grenade launcher ability... or model... or animate. though animate probably isn't needed as it could just use the standard shoot teh gun animations with it launching a grenade)