Accuracy International Chassis Magazine (AICS) is a detachable style magazine. Accuracy International Magazine. Accuracy International Chassis System.
The "AICS-style" short action box magazine was originally manufactured for the Accuracy International Chassis System, but can now be found on several production rifles, such as the SIG Sauer CROSS, the Ruger Gunsite Scout, Ruger Precision Rifle, some Ruger American Rifle models and some new production models by Remington (Model 700 PCR, 700 Tactical Chassis, 700 Magpul, and 700 Magpul Enhanced). AICS-style magazines can also be found on many custom rifles, and aftermarket conversion kits (known as "bottom metals") are available for several different rifle models and are made by several different manufacturers.
In addition to Accuracy International, there are now aftermarket manufacturers offering AICS-style magazines, such as Magpul, Accu-Mag and Modular Driven Technologies (MDT). Examples of other magazine designs include the STANAG magazine (for 5.56×45mm NATO length cartridges) and SR-25 pattern magazine (for 7.62×51mm NATO length cartridges).