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 an older model than the other.
Colt Anaconda
A corrupt police officer working for General Tuco (Yul Vasquez) 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. A CIA agent attempts to use a suppressed Beretta on Pike (Brian Bloom) in Frankfurt, Germany. He affixes a suppressor onto the gun and points it at Pike. Pike disarms the agent and hands the gun to the other agent sitting on his right side, as the first one doesn't know much about weapon handling. Pike (Brian Bloom) also has a Beretta 92FS in a tactical vest at the shootout in the harbor in the climax.
Pike (Brian Bloom) 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 throught 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 Vazquez) carries a stainless steel M1911A1 fitted with pearl grips as his sidearm.
Browning Hi-Power
Captain H.M. "Howling Mad" Murdock (Sharlto Copley) briefly uses a Browning Hi-Power in the shootout after the A-Team's final mission in Baghdad.
A guard in the prologue is seen with a Franchi PA3 shotgun.
Remington 870
A Remington 870 is used by an U.S Army MP during the escape of Sgt. Bosco "B.A." Baracus (Quinton Jackson).
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 agents and U.S Army soldiers both use MP5A3 submachine guns during the film's finale.
A guard at the bank during the the exchange of the printing plates carries a Heckler & Koch MP7 submachine gun. 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 agent in the film's finale in the harbor.
Heckler & Koch UMP
A Heckler & Koch UMP is seen being fired by a CIA 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 (Liam Neeson) in Mexico to rescue Face (Bradley Cooper). This is most likely a tribute to the original TV show, in which the Mini-14 was the favorite weapon 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 (Liam Neeson) and Lt. Templeton 'Faceman' Peck (Bradley Cooper) are both seen using M4A1 Carbines with tan furniture, Magpul CTR stocks and vertical forward grip 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
An U.S Army honor guard is shown firing M1 Garand rifles at a funeral.
SIG SG 552
Pike (Brian Bloom) carries a SIG SG 552 with a foregrip while pursuing the A-Team in Frankfurt. Note that the weapon's stock has been removed and replaced with a sling. This was propably done so that Pike could hide the rifle under his jacket.
Heckler & Koch G36K
Pike (Brian Bloom) 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 agent during the film's finale.
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 a M60E3 machine gun at the A-Team's Huey in the prologue.
Browning M2HB
Face uses a Browning M2 machine gun mounted on the M8 AGS light tank (which in reality never entered service with the US military) to shoot down an attacking UAV. Later, a CIA agent uses a M2 with a large scope during the finale.
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 just a Daewoo K3 mocked up as a M249.
Launchers
Knight's Armament Company Stand Alone M203 Launcher
Sgt. Bosco 'B.A' Baracus (Quinton Jackson) fires a KAC Stand Alone M203 grenade launcher at the Koeniggs Bank in Frankfurt.
Mk 153 Mod 0 SMAW
Pike (Brian Bloom) uses a Mk 153 Mod 0 SMAW to punch a hole into the hull of the cargo ship during the final shootout.