ATI MB3 R 12 Gauge 3" 5-Round Stainless Pump-Action Shotgun

The ATI ATIGMB3R MB3 R 12 Gauge Pump 3" 4+1 18.50" Black Smooth Bore Barrel is a purpose-built shotgun engineered for home defense and tactical applications where reliable, affordable performance is non-negotiable. Built on American Tactical's proven MB3 platform, this 12-gauge pump-action delivers the stopping power and handling characteristics operators expect from a defensive shotgun, without the premium pricing of duty-grade alternatives. The 3-inch chamber accepts both 2.75-inch and 3-inch 12-gauge ammunition, providing flexibility for different load selections and hunting applications.

The 18.50-inch barrel balances maneuverability with velocity retention—critical for defensive scenarios where the weapon must traverse tight interior spaces without sacrificing terminal effectiveness. The smooth bore design accepts standard 12-gauge ammunition configurations without requiring choke tubes. The 4+1 capacity (four rounds in the magazine tube plus one chambered) delivers five-shot loadout suitable for home defense engagements while keeping the overall weapon length manageable. The stainless steel receiver resists corrosion in humid storage conditions, while the black synthetic stock absorbs recoil effectively and tolerates hard use without damage. The receiver-mounted Picatinny rail accommodates tactical optics, lights, and other modular accessories. The blade front sight co-witnesses with optical systems for transition capability.

This right-hand configuration serves home defenders, sport shooters, and budget-conscious operators who prioritize functional reliability over extended feature sets. The MB3 R is practical for training new shooters on pump-action mechanics, establishing fundamentals before transitioning to semi-automatic platforms. At 9 lbs, the weight distribution provides stable aim during deliberate fire while remaining light enough for sustained carry during extended training sessions. The smooth bore design means ammunition costs remain lower than slug-gun alternatives when hunting waterfowl or upland game.