ATI ATIG15MS556MLP3P | RIA P3P | 5.56 | 16″ | 30rd

The American Tactical / ATI Mil-Sport RIA P3P is an AR-15 style semi-automatic rifle chambered in 5.56 NATO with a 16-inch manganese-phosphate barrel and a 10-inch M-LOK forend. The rifle ships optic-ready on a flat-top receiver and includes a Nano parts kit and magazine. Its construction uses forged aluminum receivers and a phosphate barrel finish for corrosion resistance and durability. Consider pairing this rifle with a Vortex Viper PST Gen II 1-6×24 (commonly available for under $1,000) for close-to-medium-range practical applications.

Typical applications include range/practical shooting and varmint or small-game field use where a lightweight, modular AR-15 platform is desirable.

Product Specifications

• The product UPC is 819644025290.
• The chambering is 5.56 NATO.
• The barrel measures 16 inches and features a manganese-phosphate finish.
• The barrel has a 1:8 twist rate.
• The forend is a 10-inch M-LOK handguard.
• The upper and lower receivers are forged aluminum.
• The receiver is a flat-top design and is optics-ready.
• The action is semi-automatic.
• The rifle ships with a magazine.
• The fire control group uses a Nano composite parts kit.
• The exterior finish is black.
• The model/manufacturer part number is ATIG15MS556MLP3P.
• The platform is an AR-15 style rifle.

This Mil-Sport RIA P3P blends standard AR ergonomics with a compact M-LOK handguard and a corrosion-resistant phosphate barrel finish, offering a practical combination for range-focused shooters and field users. The flat-top receiver and included Nano parts kit provide scope and accessory flexibility without excess weight. Its build targets shooters who value straightforward, serviceable components that support common optics and accessory setups.

Related Videos: