ReXcKz wrote Assault Rifles (7)

-AK47 (Rumored to be Semi-Auto)
-M4A1
-ACR 6.8
-G36c
-FAMAS (Not sure if 3 Round Burst or Full-Auto)
-M16A4 (3 Round Burst)
-FN FAL ((Semi-Auto)Most likey}
___________________________________
Sub Machine Guns (7)

-MP5A2
-MP5k
-Vector
-AK74u
-UMP45
-P90
-SCAR-L
___________________________________
Light Machine Guns (1)

-RPD
___________________________________
Sniper Rifles (3)

-Barrett .50 Cal (Semi-Auto)
-M21 EBR (Semi-Auto)
-RSASS (Semi-Auto)
___________________________________
Shotguns (5)

-AA-12 (Full-Auto)
-Model 1887 (Lever Action)
-Striker (Semi-Auto)
-SPAS-12 (Most likely Pump Action)
-KSG ((Pump Action)I think)
___________________________________
Handguns (4)

-P99 (Semi-Auto)
-SIG P228 (Semi-Auto)
-FN Five-seven (Semi-Auto)
-MP412 (Revolver)
___________________________________
Machine Pistols (3)

-Skorpion
-Magpul FMG
-Glock 18
___________________________________
Launchers (4)

-AT-4
-M320 [Individual]
-XM25
-RPG-7
___________________________________
Attachments

-Holographic Sight
-Red Dot Sight
-Magnifier (Dual Scope seen in the Gameplay)
-Suppressor
-Foregrip
-Bi-Pod (Snipers)
-ACOG Scope
-Laser Sight (Handguns)
-Grenade Launcher
___________________________________
This is as of June 21, 2011.
I just saw a lot of posts saying a random gun or two so here are all of them.
I will update when new gameplay, trailers, or leaks are released.
Update V1: Added possilbe weapons section.
Update V2: Added pictures of some weapons.
If you want proof for a particular weapon or attachment, then PM me or leave a reply.
Update V3: Some small edits, such as the MP5k and Scar-L. Also added the M16 and RPG-7 as confirmed. (Thanks to 4sure for all of the info in this update)
Update V4: Added some info for guns. i. e. if the gun is Semi-Auto or Fully, or Lever Action/Pump.
Update V5: Added some more guns and tweaked the names of some. i.e. M16 to M16A4. Again, big thanks to 4Sure for all of the information in this update. [u]