Description
Most Turkish MKA1919-style shotguns want hot 1300 fps loads before they run right. The GForce Arms MKX3 12-Hammer is built to cycle 1200 fps ammo, which means those affordable bulk birdshot boxes you grab for range days will run through it instead of choking it up. That one detail makes a real difference in how much you can afford to practice, and it sets this gun apart from a lot of the AR-12 crowd. The gas-operated buffer tube system keeps cycling smooth and consistent, and the 3 inch chamber lets you step up to heavier defensive and hunting loads when the job calls for it.
Built Like a 12 Gauge Should Be
The 18.5 inch barrel is machined from 4140 steel, and the receiver is aluminum with a black anodized finish that shrugs off scuffs and moisture. The fixed black synthetic stock and forend keep the whole package rugged without adding unnecessary weight, and the gun carries enough heft to soak up recoil without feeling like a boat anchor. Flip-up polymer front and rear sights come installed and adjustable, and the Picatinny rail up top gives you an easy home for a red dot or optic if that is more your speed.
MKX3 12-Hammer Feeding and Choke Options
Feeding comes from a detachable MKA1919-pattern magazine, and one 5-round mag ships in the box, giving you 5+1 on tap with fast reloads. You also get three choke tubes, Cylinder, Modified, and Full, in the common Benelli Mobil thread pattern, so aftermarket chokes are easy to find. Run Cylinder for defensive loads up close, screw in the Modified or Full for clays, pests, or field work, and this shotgun covers a lot of ground for one gun.
For anyone who wants a mag-fed 12 gauge with AR-familiar ergonomics that runs cheap ammo without complaint, the MKX3 12-Hammer is a hard combination to beat.
Key Specifications
- Manufacturer: GForce Arms
- Model: MKX3 12-Hammer
- MPN: GF12HMRB
- UPC: 643477868256
- Action: Gas-Operated Semi-Auto
- Gauge: 12 Gauge
- Chamber: 3 inch
- Barrel Length: 18.5 inches
- Barrel Material: 4140 Steel
- Capacity: 5+1
- Magazine Type: MKA1919-Pattern Detachable
- Receiver: Black Anodized Aluminum
- Stock: Fixed Black Synthetic
- Sights: Flip-Up Front and Rear, Adjustable
- Choke Threads: Benelli Mobil
- Country of Origin: Turkey
What’s Included
- GForce Arms MKX3 12-Hammer semi-auto shotgun
- One 5-round MKA1919-pattern magazine
- Three choke tubes (Cylinder, Modified, Full)
- Flip-up front and rear sights (installed)
Frequently Asked Questions
Will the MKX3 12-Hammer cycle cheap birdshot loads?
Yes, and that is one of its strongest selling points. While most MKA1919-style shotguns need 1300 fps or faster ammo to cycle reliably, the 12-Hammer is designed to run 1200 fps loads. That means common bulk-pack target loads should feed and cycle fine, all the way up to 3 inch magnum shells.
What magazines does the GForce MKX3 Hammer use?
It feeds from MKA1919-pattern detachable magazines, which are widely available since that platform has been around for years. One 5-round magazine comes in the box, and higher capacity aftermarket options exist if you want more on tap.
Can I mount a red dot on the MKX3 12-Hammer?
You can. The receiver has a Picatinny rail on top, so mounting a red dot or other optic is straightforward. The included flip-up sights fold down out of the way, or they can co-witness depending on your optic and mount height.
What choke threads does this shotgun use?
The barrel is threaded for the Benelli Mobil choke pattern, one of the most common thread types out there. Cylinder, Modified, and Full tubes are included, and aftermarket Mobil-pattern chokes are easy to find if you want something more specialized.



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