The ATA Arms Four Peaks Aska S4 is a 12 gauge semi-automatic shotgun built for tactical, personal/home defense, and range applications. Its dual gas piston operation is designed for consistent cycling under repeated use, while the synthetic stock and pistol grip support durable, low-maintenance handling. Integrated Picatinny rail and adjustable sights allow straightforward accessory mounting and sighting for practical shooting scenarios.

Key Specifications

• The shotgun is chambered in 12 Gauge for broad ammunition compatibility and utility.
• The action is a Semi-Auto dual gas piston system designed for reliable cycling.
• The magazine capacity is 5 + 1 rounds as supplied.
• The barrel measures 18.5 inches to balance maneuverability and pattern performance.
• The overall length is listed as 40.5 inches for the factory configuration.
• The listed weight is 10.9 (unit as supplied in source data).
• The chamber size accepts 3 inch shells for standard 12 gauge loads.
• Included features are a pistol grip, Picatinny rail, and adjustable rifle-style sights for practical setup flexibility.
• The ATF model designation is shown as S4 in the supplied product data.

Built around a proven piston system and straightforward controls, the Aska S4 is suited to users who prioritize reliability and modularity. The synthetic furniture and rail space keep it low-maintenance and ready for common tactical or range setups. Its configuration makes it a practical option for those seeking a compact semi-auto 12 gauge for training, home defense, or sporting use.