G-Force Arms MKX3 12-Gauge Tactical Shotgun

Posted: 05/23/2025

G-Force Arms MKX3 12-Gauge Tactical Shotgun

The G-Force Arms MKX3 (often referred to as the 12-Hammer) is a gas-operated 12-gauge semi-automatic shotgun with an AR-style design, 18.5″ or 20″ barrel, and 5+1 capacity. It features a 3″ chamber, aluminum receiver, synthetic stock, and flip-up sights, generally weighing around 8.2–8.4 lbs.

Specifications:

  • Action: Gas-operated semi-automatic
  • Gauge: 12 Gauge (accepts 2-3/4″ and 3″ shells)
  • Barrel Length: 18.5″ (common) or 20″
  • Capacity: 5+1 rounds (comes with 2 magazines)
  • Overall Length: 37.5″ (18.5″ barrel) or adjustable 31.1″–48.2″
  • Weight: ~8.2–8.59 lbs
  • Material: 7075 Aluminum upper receiver, polymer lower, synthetic stock
  • Sights: Flip-up/Pop-up polymer sights
  • Chokes: Uses Beretta/Benelli Mobil choke system (usually includes Cylinder, Modified, Full)
  • Controls: AR-style, including a cross-bolt safety