The graphic informations about weapons in the game are not precise and some are incorrect. Example: For the 1911 is maximum damage and maximum fire rate displayed, but the Magnum 44 has more damage and the Shadow Pistol has one shot more per second. I assume the reason for this is, that the devs did forget to recalibrate the graphic display, after inserting new weapons.
The 1911 is still a very good weapon, but not as outstanding as displayed.
Another drawback of this bar graph style is you can't really compare the different categories (Pistols, Assault-Rifles, Silenced-Rifles and Shotguns).
Mobility does not influence aiming time. In this game the aiming time belongs not directly to the weapon, it's in the attached attack types (more Infos in chapter Attack Types).
The informations are from the actual XML-files (version 1.0.9.) in the folder Steam\steamapps\common\DoorKickers\data\object_library.

Spread= accuracy / spread at 10 meters, this value is modified by nearly every attack type
AP = Armor piercing
RPS = fire rate / Rounds fired per second, but this value is overwriten by most attack types
Da= stopping power / Damage (see chapter Damage Calculation for more infos)
Up= maneuverability / Time needed for moving up the weapon in milliseconds
Mag = Bullets in one magazine
Noise= Range of the shot sound in meters
Pel = Number of pellets (only shotguns, because it's 1 for all other fire arms).
1H: One handed. The different values for the Shield class.

The classes Pointman, Assault, Breacher and Stealth can all use most of the secondary weapons.
The Shield class can use only some of them and than they have small differences in the data (one handed weapons= 1H).
Your first class Pointman and the Shield class have no primary weapon.

Some good secondary weapons:
The two doctrines Double Tap and Mozambique are a must have and your first priority. This two doctrines make secondary weapons deadly, but they work only in the range from 1.5m up to 8m.
Over 15m secondary weapons are not a good choice and the 1H versions for the Shield class are even more downsized by their own attack types.

Assault-Rifles are the primary weapons of the Assault class. The game talks in some descriptions about SMG and rifles like they are different classes, but there is no class SMG, only a class rifle.

Some good rifles:
The two SMGs P90 and MP7 are the best allrounder weapons in the game, under 15m they are firing fast with bursts (3-7m) and rapid fire (7-15m). Over 30m the long range rifles are better.
M4, SAR-18 and Bren A1 are effective in long range (15 - 60m).
For extra long range (> 60 m) the MK 17 and Bren A1 are the best weapons.

The primary weapons of the stealth class.
Some good silenced rifles:
The Honey Badger is my favorite in this category.

Shotguns are the primary weapon of the Breacher class. Shotguns are the only weapons which can attack small groups of enemies, because every shot consists of more than one pellet.

Some good shotguns:
JCS and Six 12 are with deadly rapid fire from 1.5m up to 10m, over 30m all shotguns are useless.

Damage calculation is a litte bit different compared to other games.
There are serval dices rolled to calculate the final damage.

Armor Piercing
An armor piercing check is succesfull for the attacker if the pericing level is higher than the armor protection level. A positve check lets the damage be unchanged and a failed armor piercing check results in reducing the actual damage to 1.
4 and 5 are the protection levels of armors or shields the player gets access to.
5 is the best armor piercing level of the weapons the player can get, only the enemy has access to the MP9 with an armor piercing level of 6.

Injuries
Every injury adds +1 damage for the next damage rolls.

Normal Damage Calculation
Step 1: Shots can miss a target. The accuracy depends on marksmanship of the shooter, skilled doctrines, spread of the weapon and used attack type of the weapon.
If the bullet misses = no damage and end of damage calculation.
Step 2: Cover stops 50% of the incoming bullets.
If the bullet is stopped by cover = no damage and end of damage calculation.
Step 3: Only if a shield is equipped or a teammate with shield gives cover. A dice is rolled whether or not the shield is hit by the bullet.
If the shield is hit and armor piercing level of the bullet isn't greater than the protection level of the shield, than the damage is reduced to 1 and jump to step 5.
Step 4: Only if an armor is equiped. A dice is rolled to see if the bullet hits the armor.
If the armor is hit and the armor piercing level of the bullet isn't greater than the protection level of the armor, than the damage is reduced to 1.
Step 5: Adding +1 to the damage for every injury.
Step 6: The damage dice is rolled with the probabilities from the actual damage and damage_table.xml.

Vests have for front, side and rear different covering percentage and different armor level.
Classes:

1. Pointman
   
2. Assault
   
3. Breacher
   
4. Stealth
   
5. Shield

Covering percentage, armor level
A covering of 40% means, only 40% of the bullets are hitting the armor and starting a piercing check, 60% are direct hits.
Against armored enemies: The pistol headshot from the doctrine Mozambique ignores armor.

There is a guide about influence of armor to tactics:
http://steamproxy-script.pipiskins.com/sharedfiles/filedetails/?id=458653086

Every weapon has serval attack types it can do and for fun similar weapons don't need to have the same attack types. This attack types influence precision (spread), the time to aim and possible following up shots. Every attack type has a min and a max range where it can work.
The special pistol attacks Double Tap and Mozambique work only in the short distance (1.5m - 8m).
Being in a good distance for the used weapon is a key element of doorkickers.

AM = Accuracy modifier for the base accuracy of the weapon (spreadAt10Meters). 100 is exactly the weapon's base accuracy and 50% means the spread is doubled.
AimTime = Aiming time in ms. ~ = average
AS = Possible additional shots with lower aiming time and different precision. R = rapid fire, continuously shooting.

A list only for some long and medium range attack types and some of their values (more details in firearm_attacktypes.xml)

Pistols are not made for long range battles and as you can see the 1H versions for the Shield class are even more downsized by their own attack types.
Silenced weapons use normally the same attack types as the non silenced versions.
In short range are many attack types with bursts or rapid fire.

Question on weapons (attack types)
http://steamproxy-script.pipiskins.com/app/248610/discussions/0/458604254474166545/

Comment
The damage calculation was'nt complicated enough so the devs implemented attack types to disturbe the players even more and to hide bonuses for the enemy.
I hope they make it less complicated in Doorkickers 2.

After reaching team level 4, 8, 12 and 16 you get access to new classes.

It is your first class and it has no primary weapon.
This makes them run faster, but it doesn't make them aim or shoot faster!
The two doctrines Double Tap and Mozambique are a must have and your first priority. This two doctrines make secondary weapons deadly, but they work only in the range from 1.5m up to 8m.
First new gear: 1911 (5 stars) and Assaulter Vest (10 stars). As long as you don't have the Stealth class you can help yourself with the silent Tazer and Mark23-SD.
Late game: Useful when speed is needed, than reduce the armor weight with the Raider Vest.
The classes Assaulter, Breacher and Stealth are as good at shooting with secondary weapons as the Pointmann class.

In short it's a Pointmann with an additional primary weapon. The already unlocked 1911 and Assaulter Vest suit this class.
First new gear: Buy the P90 (15 stars) its good for short and middle range and for longer distances the M4 (6 stars) it's an inexpensive and good long range weapon. If movement speed is not needed always prefer the Assault class over the Pointman class and switch weapon as needed.
Late game: The Bren A1 is a great weapon for very long distances.

With the doctrine One Shot Breach they are the fastest door unlocker in the game and great against near grouped enemies.
First new gear: The JCS (Joint Combat Shotgun) (15 stars) is a quantum leap.

On the one side they have additional armor from the shield, on the other side they are bad shooter, because:
1. Attack types are downsizing strongly the 1H weapons.
2. The doctrines Double Tap and Mozambique can't be used by the shield class.
Good thing: The shield protects also other team members.
Avoid shootouts on middle and long range, if you don't have a teammate firing over your shoulder!
First new gear: The Magnum 44 1H (15 stars), because it has high damage and less downsizing than most other 1H weapons. The Ironman Shield (15 stars) is the only choice.
Don't waste your stars to shields which can't block rifle calibers (bullets with armor piercing level 5)!

This is not really a stealth game and most missions can't be totally solved in silenced, but a silent start can give you an advantage for the the big shootout. The biggest problem is to silence the enemy before he can shoot back or shout out. With the doctrin Go Silent it is possible to coordinate silent attacks. In close range the Tazer is the best choice against a single enemy.
First gear: The Honey Badger (30 stars) it's very quiet and has a high damage.

A guide about classes:
http://steamproxy-script.pipiskins.com/sharedfiles/filedetails/?id=334788424

If you have problems to distinguish between paths from different team members, you can choose Colored paths in the option menu.

In Doorkickers grenades can fly over the whole map with 100% precision.

In random missions you can collect every time 3 stars.


You get an additional doctrine point for every new team level (click to enlarge the screen shot).

The campaign missions are unlocked at team level 6, but at least wait for team level 12. The additional doctrine points and more available classes are very helpful.
Your squad members can really die in a campaign, if you finish a mission with dead personal. They don't die, if you restart the mission as long as you are still in the mission!

Do I lose my men, if they die?
http://steamproxy-script.pipiskins.com/app/248610/discussions/0/412448158143092659/

Does mobility affect aiming speed?
http://steamproxy-script.pipiskins.com/app/248610/discussions/0/360670708794964174/#c360671352679462832

Great game! But.... (injuries)
http://steamproxy-script.pipiskins.com/app/248610/discussions/0/617336568085856211/#c617336568086426603

F'ing Al Pacino or something... (doctrine Mozambique)
http://steamproxy-script.pipiskins.com/app/248610/discussions/0/618460171315310405/#c618460171327929175

... campaign 2 key witness escort duty
http://steamproxy-script.pipiskins.com/app/248610/discussions/0/494632768632463284/

So what happened to co-op and zombies?
http://steamproxy-script.pipiskins.com/app/248610/discussions/0/458605613402271491/

A good guide about tactics:
http://steamproxy-script.pipiskins.com/sharedfiles/filedetails/?id=200580844

http://steamproxy-script.pipiskins.com/sharedfiles/filedetails/?id=366985928
http://steamproxy-script.pipiskins.com/sharedfiles/filedetails/?id=452410411
http://steamproxy-script.pipiskins.com/sharedfiles/filedetails/?id=367403269