Takumi's Shotgun

 is a semi-automatic shotgun created by Takumi Uchiha. This was the first gas-operated shotgun produced. Its function is designed around an entirely new method called the "auto regulating gas operated" (ARGO) system. The short-stroke design uses two stainless-steel self-cleaning pistons located just ahead of the chamber to function opposite the rotating bolt, thereby eliminating the need for the complex mechanisms found on other gas-actuated automatics. The ARGO incorporates only four parts: two symmetrical shrouds containing two small steel gas pistons.

Overview
Additionally, the weapon is self-regulating for use with cartridges of varying length and power levels. It can fire 2.75 and 3-inch (76 mm) shells of differing power-levels without any operator adjustments and in any combination. Low-power rounds, such as less-lethal rubber pellets, must be cycled manually.

The sights are military-style ghost ring and are adjustable in the field using only a cartridge rim. The MIL-STD-1913 Picatinny sight rail on top allows use of both conventional and night-vision sights, while retaining use of the original sights. The modular basis of the shotgun means many of its features can be reconfigured as needed. It allows a user to quickly exchange the various assembly groups (barrel, buttstock, forearm, etc...) without the use of tools.

Preliminary testing of the Shotgun suggests a high level of reliability. It can reliably function for at least 25,000 rounds without replacement of any major parts. The steel components of the weapon feature a matte black phosphated corrosion resistant finish while the aluminum parts are matte hard-anodized. These finishes reduce the weapon's visibility during night operations. The gun does not need any form of maintenance and operates in all climates and weather conditions.