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The following weapons were used in the television series Kamen Rider Build:

Pistols

SIG-Sauer P228

The SIG-Sauer P228 is used by Touto security forces as their main sidearm.

The SIG-Sauer P228 from In the Line of Fire.

TSF officers apprehend Ryuuga after they find him next to a corpse with a bloodied knife in "The Innocent Runaway".

Submachine Guns

Heckler & Koch MP5A3

The Heckler & Koch MP5A3 is seen with Touto security forces throughout the show.

Heckler & Koch MP5A3 with Navy trigger group (non-colored marking) - 9x19mm

A TSF officer with the MP5A3 in "These Guys are a Best Match". The stock is extended out, but you can partially make it out since it's in front of his gray combat jacket.

In this shot, you can see the MP5A3's barrel, which at least confirms that it's not the MP5J variant.

Assault Rifles

Colt AR-15 Sporter II Lightweight

A Colt AR-15 Sporter II Lightweight with a M16A1-type foregrip is used some officers in the Touto security forces.

Colt Sporter-II Carbine with solid stock (photo-shopped image) - 5.56x45mm

A TSF officer approaches Ryuuga in "These Guys are a Best Match".

Closeup of the barrel and foregrip.

Guardian Assault Rifle

A fictional assault rifle with a bayonet permanently attached to it is used by Guardian security robots throughout the show.

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Closeup of the rifle's stock in "These Guys are a Best Match".

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Closeup of the rifle's barrel and bayonet, the latter built into the rifle's frame.

A good shot of the AR used by the Guardians in "The Innocent Runaway".

Multiple ARs attached underneath the head of a huge Guardian mech.

Machine Guns

General Dynamics M61 Vulcan

The image of a M61 Vulcan is seen in the Build Driver belt when Ryuuga inserts the Gatling Full Bottle on a slot in "Borderline of Justice".

GE M61 Vulcan Cannon - 20mm

The M61 Vulcan CGI image seen on the Build Driver's henshin belt in "Borderline of Justice".

General Dynamics M197 Vulcan

The General Dynamics M197 Vulcan is seen on Build's HawkGatling form when it was first used in "Borderline of Justice".

File:M197Gatling2.jpg

General Dynamics M197 Vulcan - 20x102mm

The barrels of the M197 Vulcan

Rocket Launchers

M72 LAW

M72 LAW rocket launchers are seen in "These Guys are a Best Match" by Guardians pursuing Ryuga and Build.

Early production M72 LAW (inert drill version) - 66mm

Guardians take aim with the LAWs in "These Guys are a Best Match".

Rear shot of the LAW missile tube.

Guardians take up positions near the Touto Skywall.

Others

Rotary SwordGun Drill Crusher

The Rotary SwordGun Drill Crusher is the weapon of Sento Kiryu (Atsuhiro Inukai) aka Kamen Rider Build. It has the ability to change into a sword or a gun, depending on the need.