Colonel John 'Hannibal' Smith (Liam Neeson) carries a Para-Ordnance S14-45 Limited, and uses it throughout the whole movie. There is a slight continuity error in the beginning: The P-14 that Tuco's henchman tries to kill Hannibal with has 6 front slide serrations. The one Hannibal uses after that (also for the rest of the film) has only three. This means that one of the P-14s used on-set was older than the other.
Colt Anaconda
A corrupt policeman working for General Tuco brandishes a Colt Anaconda revolver in the film's prologue.
Smith & Wesson Model 28 "Highway Patrolman"
One of General Tuco's men is briefly shown firing a Smith & Wesson Model 28 revolver in the film's prologue.
Beretta 92FS
Various U.S Army soldiers use Beretta 92FS pistols during the film, including members of Lt. Sosa's DCIS team. Agent Kyle pulls a Beretta on Pike in Frankfurt, Germany but then clumsily tries to affix what he calls a "European silencer" onto the Beretta, while holding the loaded pistol between his knees and pointed at his own head, before which he had dropped the suppressor on the floor while chambering the pistol. Meanwhile, an exasperated Pike corrects him by saying that it's a suppressor, and also reminds him it threads on counterclockwise. Pike disarms the agent and hands the gun to the other agent sitting on his right side; that agent then awkwardly holds the gun against his head while trying to cover his ear during a phone call. Pike also has a Beretta 92FS in a tactical vest at the shootout in the harbor in the climax.
Pike (Brian Bloom, the film's writer) uses a SIG-Sauer P226 pistol when he kills the rest of his Black Forest guys in Baghdad, and in Frankfurt while pursuing the A-Team. Lynch (Patrick Wilson) also carries a P226 throughout the film, and is seen pulling it on Pike in the car in Frankfurt.
Glock 17
Lieutenant Templeton 'Faceman' Peck (Bradley Cooper) uses a Glock 17 as his sidearm throughout the film. In addition to his Glock 17, he carries a Walther P99 in a cross-draw holster during the Baghdad mission.
M1911A1
General Tuco (Yul Vasquez) carries a stainless steel M1911A1 fitted with pearl grips as his sidearm.
CZ-75B
Captain H.M. "Howling Mad" Murdock (Sharlto Copley) briefly uses a CZ 75B in the shootout after the A-Team's final mission in Baghdad.
Walther P99
Face has a Walther P99 holstered in his tactical vest while in Baghdad.
Shotguns
Franchi PA3
A guard in the prologue is seen with a Franchi PA3 shotgun.
Remington 870
A Remington 870 is used by a US Army M.P. during the escape of Sgt. Bosco "B.A." Baracus.
There is also a Remington 870 slug gun with synthetic furniture and an extended tube magazine seen in the hands of one of General Tuco's men.
Submachine Guns
Heckler & Koch MP5A3
CIA Special Activities Division/ Special Operations Group agents and U.S Army soldiers both use MP5A3 submachine guns during the film's finale.
Heckler & Koch MP5K
Lynch uses a Heckler & Koch MP5K in the film's finale. Like Pike's stockless SG 552, it's fitted with a single-point sling, allowing the user to pull the gun tight against the sling for additional support in place of an actual stock.
Heckler & Koch MP7
A guard at the bank during the the exchange of the printing plates carries a Heckler & Koch MP7 SMG. It is hard to see due to being a black gun held in front of a black trench coat. Also an MP7 is used by a CIA SAD/ SOG agent in the film's finale in the harbor.
Heckler & Koch UMP
A Heckler & Koch UMP is seen being fired by a CIA SAD/ SOG agent in the film's finale in the harbor.
IMI Uzi
An IMI Uzi is seen carried by a guard outside the bank.
Rifles
Ruger Mini 14 Stainless version with Folding stock
The classic Ruger Mini-14 with a factory folding stock in stainless steel is used by Col. "Hannibal" Smith in Mexico to rescue Face. This was done as a tribute to the original TV series where the Mini-14 was a favorite of the A-Team.
Heckler & Koch HK33
One of General Tuco's soldiers is briefly seen with a scoped HK33 while searching for the A-Team.
Heckler & Koch G3A3
Several of General Tuco's men use Heckler & Koch G3A3 rifles when pursuing the A-Team in Mexico.
M4A1 Carbine
Col. John 'Hannibal' Smith and Lt. Templeton 'Faceman' Peck are both seen using M4A1 Carbines with tan furniture, Magpul CTR stocks and vertical forward grips during their final mission in Baghdad. Hannibal's M4A1 has an EOTech XPS sight while Face's has an Aimpoint M4S. Face also wields an M4A1 in the harbor shootout in the climax.
M16A2
Several U.S Army soldiers in Iraq are seen with M16A2 rifles.
Zastava M70AB2
Iraqi guards escorting a valuable cargo in Baghdad are armed with Zastava M70AB2 rifles.
M1 Garand
A U.S Army honor guard is shown firing M1 Garand rifles at a funeral.
SIG SG 552
Pike carries a SIG SG 552 with a foregrip and micro red dot sight while pursuing the A-Team in Frankfurt. The weapon's stock has been removed and replaced with a sling, allowing Pike to conceal the rifle under his jacket. Pike can be seen reloading the rifle at least four separate times throughout the chase.
Heckler & Koch G36K
Pike uses a Heckler & Koch G36K fitted with rails and a foregrip during the film's finale. They are also carried by Black Forrest contractors in Iraq, and by a CIA SAD/ SOG agent during the film's finale.
An F-22 Raptor is seen defending US airspace in the prologue, armed with an M61 Vulcan cannon. American F-18 Hornets in Germany (actually Canadian CF-18 Hornets) are also armed with Vulcans.
GE M134 Minigun
Murdock fires a GE M134 Minigun from a V-22 Osprey on the soldiers who pursue the A-Team during the Baghdad mission.
M60E3 Machine Gun
A gunner aboard General Tuco's helicopter (played by the film's armorer Rob Fournier) fires an M60E3 machine gun at the A-Team's Huey in the prologue.
Browning M2HB
Face uses a Browning M2 machine gun mounted on an M8 Buford light tank (which in reality never entered service with the US military) to shoot down an attacking MQ-9 Reaper UAV; the Buford and Reapers are both referred to by name. The Reapers themselves are armed with an exaggerated loadout of eight AIM-9 Sidewinder missiles, along with a fictional internal machine gun (possibly a pair), the muzzle flash appearing under the nose near where the drone's camera is.
Browning M2HB (Mocked up as DShK heavy machine gun)
Browning M2 machine guns mocked up to resemble the DShK heavy machine gun are mounted on vehicles escorting a valuable cargo in Baghdad.
M249 SAW Para
A M249 is seen carried by a "Black Forest" contractor early in the movie. Note that since this film was shot in and around Vancouver, this could also be a Daewoo K3 mocked up as a M249.
Launchers
Bofors 40mm
An AC-130 is sent to eliminate the A-Team, and uses its Bofors cannon to utterly demolish a large building. The AC-130 is also armed with an M102 howitzer and GAU-12/U rotary cannon. Watching the live footage, Lynch comments "Wow, that's awesome. It looks exactly like Call of Duty, doesn't it?".
Knight's Armament Company Stand Alone M203 Launcher
Sgt. Bosco 'B.A' Baracus fires a KAC Stand Alone M203 grenade launcher at the Königsbank in Frankfurt.
Mk 19 Automatic Grenade Launcher
A Mk 19 grenade launcher is briefly seen use by the CIA team at the port, fitted with a night vision scope. It's implied to be what causes many secondary explosions on the cargo ship, though it's not explicitly seen firing, nor are tracers visible.
Mk 153 SMAW
Pike uses a Mk 153 SMAW to punch a hole into the hull of the cargo ship during the final shootout. Face refers to the weapon by name, "SMAW".