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The following weapons were used in the anime series Heavy Object:
A SIG-Sauer P228 appears to be used by the Faith Organization military as its main sidearm in the show.
SIG-Sauer P230
A SIG-Sauer P230 is used by Legitimacy Kingdom soldiers as their main sidearm in the show.
Assault Rifles
AK-100 Type Rifle
A fictional variants of the AK-100 rifle series used by Intelligence Alliance troops as their main assault rifle in the show.
FAMAS
The FAMAS is used by Faith Organization troops as their main assault rifle in the show. They're depicted with an integral grenade launcher underneath the barrel. Sometimes, they're depicted in a conventional or bullpup configuration in some continuity errors.
FN F2000
The FN F2000 is seen in the hands of FO troops in an animation error in "The Little Soldiers Who Tie Down Gulliver / The Snowy Deep Winter Battle of Alaska II".
Fictional Assault Rifle
A fictional assault rifle is seen with Legitimacy Kingdom soldiers as their main assault rifle. It has a conventional layout with provisions for scopes and a directional microphone.
Fictional Carbine Rifle
A fictional carbine-type assault rifle is seen with armed terrorists in Antartica throughout "In an Obstacle Course Race It's Normal to Get Covered in Mud / The Battle for Supremacy in Antartica".
Machine Guns
Afanasev A-12.7
What appear to be Afanasev A-12.7s are used by Ocenian Military gunships in the middle of "The War of the Ant and the Grasshopper / The Invasion of the Oceanian Military State I".
Browning M2HB
A Browning M2HB is used on Legitimacy Kingdom and Faith Organization military vehicles in the show.
M61 Vulcan
A M61 Vulcan in a CIWS Phalanx-type mount is seen with allied navy ships at the start of "The Little Soldiers Who Tie Down Gulliver / The Snowy Deep Winter Battle of Alaska I".
Sniper Rifles
Barrett M82A1M
A Barrett M82A1M was used by Frolaytia Capistrano near the end of "The Little Soldiers Who Tie Down Gulliver / The Snowy Deep Winter Battle of Alaska III" to gun down a FO commander. It's used like a sniper rifle when in fact, the M82A1M is used as anti-material rifle.
Rocket Launchers
FGM-148 Javelin
An FGM-148 Javelin is seen with Heivia Winchell as his main anti-armor weapon throughout the series.
Others
Legitimacy Kingdom Oil Rig Base Armory
A few assault/battles rifles are seen in the LK Oil Rig's armory in "Tom Thum Races Through the Oil Field / Battle to Blockade the Gibraltar I".