The FMK Firearms G3 (Gen 3) is a compact, polymer-frame, striker-fired 9mm pistol with a 4.5-inch threaded barrel and an optic-ready slide machined to accept several popular micro red dot sights directly, without needing a separate mounting plate. It ships in a Dark Earth finish with a textured frame for grip, and it retains fixed iron sights alongside the optic cut. The pistol runs on a detachable magazine, with FMK-brand magazines built for the platform. 
 

Key Specifications 

• Brand: FMK Firearms 
• Model: G3 (Gen 3) 
• Caliber: 9mm 
• Barrel Length: 4.5" 
• Capacity: 14+1 
• Finish: Dark Earth 
• Frame Material: Polymer 
   

Detailed Features 

• Threaded 4.5-inch barrel for mounting a suppressor or other muzzle device 
• Slide is machined to directly accept select micro red dot sights 
• Fixed iron sights are retained alongside the optic cut 
• Textured Dark Earth polymer frame for a secure grip 
• Striker-fired trigger system in a compact-size pistol frame

FMK sits in the budget tier of the striker-fired 9mm market, and owner opinions on the G3 reflect that split. Some report the pistol runs reliably once broken in, while others compare the fit and finish unfavorably to bigger-name compacts. The threaded barrel and optic-ready slide get noted as unusual features to find at this price point.

Ergonomically, the compact frame and textured grip work fine for concealed carry, though some shooters find the trigger reach and reset less refined than what they are used to from larger manufacturers. The factory optic cut is a common point of praise since it saves the cost of milling the slide separately.

On value, the G3's main draw is price relative to what it includes, but aftermarket support for holsters, sights, and spare magazines trails well behind major brands, so buyers sometimes have to search harder for compatible gear.