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The following weapons were used in Season 2 of the series Falling Skies:
In Season 2's premiere "Worlds Apart" (S2E01), Tom Mason (Noah Wyle) takes a Taurus Model 689 off a crazed survivor who attacked a young girl.
Rifles
Colt M4A1 Carbine
Colt M4A1 carbines can be seen carried by resistance fighters with and without red dot sights, RIS foregrips and grenade launchers. The resistance fighters who carry the rifle include Dai (Peter Shinkoda), Maggie (Sarah Carter) and Jimmy Boland (Dylan Authors).
IMI Galil SAR Carbine
Hal Mason (Drew Roy) appears to carry a Galil SAR carbine as his preferred weapon.
Tom Mason appears to have switched from his AKM to a Zastava M70, as noted by the three vent holes in the handguard, grenade sight, and black pistol grip. Whether this rifle is the B1 variant or a standard M70 is to be determined.
Machine Guns
Browning M2HB
A Browning M2HB seen in Season 1 mounted in a Pontiac GTO is briefly glimpsed in Season 2's premiere "Worlds Apart" (S2E01).
DShK Heavy Machine Gun
A DShK mounted on the back of a pickup truck is used by Dai (Peter Shinkoda) to shoot down an alien flyer in "Shall We Gather at the River" (S2E02). He mentions that the machine uses "20mm" rounds, not the usual ammunition for this MG. This DShK also appears to be lacking the distinctive muzzle brake.
M60
An M60 is briefly seen used by a member of Pope's "Berzerkers" at the beginning of "Worlds Apart" (S2E01).
Submachine Guns
Beretta M12
A 2nd Mass fighter uses a Beretta M12 while holding off skitters in "Shall We Gather at the River" (S2E02). Crazy Lee (Luciana Carro), one of Pope's "Berserkers", can also be seen in (S2E02) with a slung M12 while discussing the possible survival of Bob Dylan.
In "Compass" (S2E03), Jimmy (Dylan Authors) is seen armed with a Mossberg 500 shotgun. The shotgun is fitted with a night vision scope and a suppressor and is sometimes loaded with a special incendiary round manufactured by Pope's Berzerkers.
Winchester Model 1300
Pope uses a Winchester Model 1300 shotgun fitted with a pistol grip at the beginning of "Worlds Apart" (S2E01).
Other
Barrett M82A1
A Barrett M82A1 is used by a fighter in "Young Bloods" (S2E04).
M72 LAW
An M72 LAW is seen used by Maggie (Sarah Carter) to take out a Mech in "Worlds Apart" (S2E01). Dai uses a LAW to take down an alien communication antenna in "Shall We Gather at the River" (S2E02).