The Town is an upcoming 2010 crime/drama film starring Ben Affleck (who also directed the film) as a bank robber who begins to have feelings for a victim of one of his earlier heists. All pictures are from the trailer.
The one closest to the camera is a TEC-9 or some variation of the same design.
The next is the grip of the DSA SA58 OSW.
The gun closest to "Jem" is the HK-416.
Shotguns
Remington 870
FBI Special Agent Adam Frawley (Jon Hamm) uses a Remington 870 with a shot shell holder. One of the FBI agents is seen witha regular wooden one.
One of the robbers uses a Heckler & Koch HK416 with "jungle-style" taped magazines during the robbery where Claire (Rebecca Hall) is taken hostage.
M4 Carbine
Doug MacRay (Ben Affleck) and some FBI SWAT are shown with M4 carbines.
AKMS
A shortened AKMS rifle is used by Jem disguised as a paramedic.
AKMSU
A robber fires an AKMSU carbine at Boston Police and FBI agents during a car chase.
Note that the shooter in this shot is left-handed, and that Jem aims an aforementioned USP compact with his left hand in another shot. This shooter might very well be Jem.
Jeremy Renner is left handed in real life, and shoots with his left hand in SWAT, 28 Weeks Later, and The Hurt Locker, so yep, it makes sense.
AKU-94 Bullpup
One of the members of MacRay's crew is armed with an AKU-94 bullpup rifle with a red dot sight.