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"This 12-gauge combat shotgun is fully automatic and drum-fed. Great for blasting holes in walls and possesses surprisingly low recoil and muzzle rise."
— In-game description

The ACS12 is a shotgun featured in Tom Clancy's Rainbow Six Siege. It was introduced in the Operation Para Bellum expansion and is available for use by both GIS Operators.


The Auto Assault-12 (AA-12) is a shotgun developed in 1972 by Maxwell Atchisson. The current 2005 version has been developed over 18 years since the patent was sold to Military Police Systems, Inc. The original design was the basis of several later weapons, including the USAS-12.

In-game, designated as the ACS12, this shotgun boasts the highest round capacity as well as a fully-automatic fire mode, making this gun perfect for creating massive openings and pumping out a lot of damage when pointed at the enemy. In addition, the default iron sights are similar to the MP7 in that they obstruct vision minimally when aiming down sights.

Weapon Attachments

Under Barrel


  • The AA-12's in-game designation, ACS12, has been previously used in another Tom Clancy game where it appears, Tom Clancy's Splinter Cell: Blacklist.
  • The AA-12 in reality fires in an open bolt configuration, meaning that holding an additional shell in the chamber would be impossible, unlike its in-game counterpart.
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