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Yes it is threaded with a 1/2 x28 TPI pattern see******Details
Brand: Kel-Tec
Model: P17
Caliber: 22 LR
Capacity: 16
Action: Semi-Auto
OAL: 6.70"
Sights Configuration: Fiber Optic Front / Adj Rear
Barrel Finish: Black
Barrel Material: Steel
Frame Material: Polymer
*****Thread Pattern: 1 / 2"x28
Barrel Length: 3.80"
Max Capacity: 16
Weight: 14 oz

Hi Robert and welcome. Yes, the barrel itself is 3.80 inches long, threaded (1/2"x28), and ready to accommodate a suppressor. Cheers and stay safe!

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