Some of my probably meh and generic weapon ideas that I'd draw out if I was any good at that (Darkstar/Jon/Failureguy/every other good fan artist here pls help)
Civil Security:
Handcannon CS-(insert something here)
Heavy counterpart to the CS-Pro, slow fire rate (slowest of all pistols), can go through 2 blocks even when not upgraded (max of 4), does 95 damage, fire rate of 2 shots per second, and has a magazine size of 5.
Kicker CS-SMG, Slot 2 (maybe 1)
Basic submachine gun, would look like a cross between an MP7 and an MP5, would be used by CS Lites and maybe Ghosts, fire rate of 20, poor accuracy, about 20 damage per hit, and a mag size of 50.
Battle Rifle CS-BR, slot 2
Basic three round burst battle rifle, used by CS Lites and Bosses, would likely look like the one Rayie made on the fan art for pb2.5 topic, with a scope. It could maybe have a laser similar to the one on the CS sniper rifle, but shorter.
Hound Walker Rocket Cannon
A pretty massive hound walker colored four burst rocket launcher, would look and work somewhat like the M202 rocket launcher, but much bigger to fit the Hound Walker. Would fire slow rockets that have slight homing. It would fire rockets one by one at a slow rate and would deal around 200-300 damage per rocket. A red light on the top would show it is reloading.
Vehicle Railgun
Pretty much a heavy railgun for vehicles, used on Civil Security vehicles.
(http://i.imgur.com/e8Zhlql.png -Darkstar 1's drawing of it.)
Usurpations:
Alien Railgun, slot 4
Just a Usurper version of the Lite Railgun. The gun would look somewhat like a cross between the drone gun and the Lite Railgun. Fires three rails at once, can fire 3 bursts before reloading for 3-5 seconds. There is a 2-3 second delay for every burst. Each rail does around 100 damage, but it is hard to hit a target with all three rails.
Used by Destroyers and maybe majors.
Alien Beam Rifle, slot 4
An alien sniper rifle, it would be pretty much a longer Alien Rifle with a scope, green laser (like the cs sniper's laser) and other minor details, such as a aimming light (like the cs sniper's light) which would be dark blue by default but when aimmed at a target, would change to a lighter color. The gun would automatically fire rails (or bullets, idk which) at a faster fire rate than that of the cs sniper but less damage (autosniper anyone?). Used by Major Usurpations, and some Destroyers.
Alien Grenade Launcher, slot 7
A heavy weapon that fires heavily arcing green BNG like explosives at a slow rate of fire. Leaves a pool of acid/radiation that goes away after awhile. Would be somewhat based of the design of the BNG but way more Usurpation like. The explosive would go off whenever it hit something.
Used by solely by Destroyers.
Alien Automatic Plasma Launcher, slot 8
I'll be honest i have no idea what this could look like. It would basically be a Usurpation counterpart to the Plasmagun, but its projectiles have slight homing, as well as being slightly radioactive. It would feature less damage and a slightly faster fire rate.
Correction Nine/TCoRR:
Grenade Launcher C-02g slot 5
Would look a bit like the halo reach grenade launcher shown here. It would have a magazine under it, a chainsaw style handle above the weapon, as well as other changes, of course. Would have a mag size of 5 and fires normal C9 grenades with a 3 second timer, with a slow fire rate and more damage. They do not explode on anything other than the timer. Could have a secondary fire that fires all the grenades in the mag at once but then overheats the weapon for 5 seconds.
Used by Falkoks, rarely Usurpation Destroyers, and some Civil Security Bosses (and C9/Human Soldiers if they are ever added in as enemies).
Target Designater C-02e, slot 6(?)
Small pistol-like weapon, would fire a grenade out that sticks to the ground, and after a short period of time the area is bombarded. Suppose this would work only outside. 5 second reload, limited uses.
Ray Sniper TCoRR, slot 4
Pretty much a sniper rifle version of the ray rifle. Made by the same Mars aliens that make the ray rifle (TCoRR).
Two burst, side by side bullets (like the alien shotgun), somewhat high fire rate, slightly less damage than the alien rifle, poor penetration. Shots are a little slower than normal (would also apply to the ray rifle, slower bullets would be a nice nerf for the weapon), and a low mag size/overheat of 10 to balance it out. Used by TCoRR (if ever added in as a faction) and whatever enemies get a hold of this gun, I guess