Hi James and welcome to the Buds Community. This rifle has a 18.3 inch Threaded Barrel with a thread pitch of 1/2x28mm &
1:16 Twist Rate. Cheers and stay safe!

James, it sure is. This does have a threaded barrel. Unfortunately rock island armory doesn't specify the thread pitch and can't find any information but my guess would be it's 1/2×28 tpi like all their other 22lr rifles. I personally don't own one but have bought quite a few rock island armory firearms and have always been impressed with their quality for the price point, so I'm sure this is no different. Hope this helps.

Hi James, yes sir, the barrel is threaded and has a 1:16 twist.
Stay safe & have a great day!

Yes, it does have a threaded barrel. Here are the full specs:
Rock Island Armory YTA Bolt Action Rifle Specifications and Features:
Manufacturers Number 51168
.22 Long Rifle (LR) Caliber
Right Hand Bolt Action
18.3 inch Threaded Barrel
1:16 Twist
10 Round Detachable Magazine
Length of Pull 12 inches
Trigger Pull 4 to 6 lbs
Overall Length: 40.5"
Overall Unloaded weight: 6lbs
Black Parkerized Barrel
Black Polymer Stock