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The following weapons were used in Season 4 of the series Falling Skies:
Pope is seen armed with an AKS-74U in Season 4's premiere "Ghost in the Machine" (S4E01).
Norinco Type 84S (mocked up as AK-74M)
Several resistance fighters are armed with Norinco Type 84S rifles. They are fitted with synthetic furniture and AK-74 flash hiders, and are apparently meant to be stand-ins for the AK-74M, but are recognizable as the Type 84 due to their .75" hooded front sights and metal magazines.
CZ 805 BREN A2
CZ 805 BREN A2 continue to be seen in the hands of resistance fighters. The version seen on the show is the two-tone version with the tan upper receiver.
Heckler & Koch G36K
The Heckler & Koch G36K rifle fitted with a foregrip continues to be the weapon carried by Ben Mason (Connor Jessup) in Season 4's premiere "Ghost in the Machine" (S4E01).
M4A1 Carbine
Colt M4A1 carbines can be seen carried by resistance fighters throughout Season 4, notably Maggie (Sarah Carter) and Anne (Moon Bloodgood).
M1 Carbine
Matt Mason (Maxim Knight) carries the M1 Carbine rifle in Season 4's premiere "Ghost in the Machine" (S4E01).
M16A2
M16A2 rifles are carried by several Resistance fighters.
The Norinco QBZ-97B carbine also is seen in Season 4. Since the series is filmed in Canada, the production crew utilized Canadian film armorers, who had Norinco QBZ-type rifles.
In Season 4's premiere "Ghost in the Machine" (S4E01), Anne (Moon Bloodgood) is seen taking up a Daewoo K3 light machine gun fitted with a rail forearm and vertical grip (the machine gun is most likely supposed to be the FN Minimi SPW). This appears to be same weapon seen used in the film Sucker Punch (2011).
DShK Heavy Machine Gun
In Season 4's premiere "Ghost in the Machine" (S4E01), the dual-mounted DShK heavy machine guns are seen mounted atop another vehicle of the 2nd Mass.
Browning M2HB
In Season 4's premiere "Ghost in the Machine" (S4E01), a Browning M2HB is mounted on atop another vehicle of the 2nd Mass.