The Just Right Carbines 9G3TBTL is a 9mm semi-automatic carbine with a 17-inch barrel, 17-round capacity, and matte black finish. Weight is 6.5 lbs. The operating system is simple blowback, and the bolt can be configured for left- or right-hand ejection. Receiver is aerospace-grade aluminum with hardcoat anodizing. The forend is a free-floating quad rail. Standard M4 buffer tubes mean most aftermarket stocks and accessories fit without modification. 
 
The carbine also accepts conversion kits for other pistol calibers, which expands its usefulness for shooters who want one platform with multiple caliber options. 
 

Key Specifications 

• Caliber: 9MM Luger (9X19 Para) 
• Action: Semi-Automatic 
• Capacity: 17 Rounds 
• Barrel Length: 17 inches 
• Weight: 6.5 lbs. 
• Finish: Matte Black 
• Receiver Finish: Matte Black

Just Right Carbines Gen 3 owners in 9mm most often highlight the Glock magazine compatibility as the main reason they chose it. If you already run Glock pistols, sharing magazines simplifies logistics, and that's a genuine practical advantage. Build quality and the matte black finish get positive mentions, and recoil from a 9mm blowback carbine is mild enough that most shooters find control easy.

Weight at 6.5 lbs. is occasionally raised. For a 9mm carbine it's on the heavier side, which matters for extended carry. Some users have run into feeding issues with certain ammunition brands, though this appears inconsistent across individual rifles. Overall reception is positive, with the combination of Glock mag compatibility, caliber conversion potential, and standard M4 accessories fitting being the recurring reasons buyers recommend it.