Hi Sean, yes sir, the barrel is threaded 1/2 x 28
Stay safe & have a great day!

Hi Sean and welcome. Yes Sir, this model has a 16.25 inch Barrel threaded 1/2"-28 RH with a Twist Rate of 1:10". Cheers and stay safe!

Yes.
KEL-TEC SUB-2000 SPECIFICATIONS
Brand: Kel-Tec
Model: Sub-2000
Stock Finish: Black
Action: Semi-Auto
Caliber: .40 S&W
Capacity: 10+1
Sights: Adjustable Front, Ghost Ring Rear
Muzzle: Threaded
Magazine Type: Glock Compatible
Grips: Black Polymer
Hand: Right
OAL: 29.25"-30.50"
Receiver Finish: Black
Receiver Material: Aluminum
Safety: Crossbolt
Stock Description: Adjustable
Stock Material: Synthetic
Trigger: Single-Stage
Twist: 1:10"
Weight: 4.20 lbs
Barrel Description: Lightweight
Barrel Finish: Black
Barrel Length: 16.25"