Yes, the barrel is threaded 5/8 x 24.

Hi Caleb and welcome. Yes, this model has a 16.5" Lothar Walther Barrel, with a Rate-of-twist of 1-in-7 inches and Thread Pattern: 5/8x24 with thread protector. Cheers, stay safe and enjoy!

Hi Caleb, yes sir, the 16.5" Chromoly fluted barrel is thredaed 5/8 x 24
The Outfitter G3 is also equipped with Traditions® Elite XT™ trigger system. The Elite XT™ trigger system is designed with a rebounding hammer and a manual cross block trigger safety. The Elite XT™ trigger allows the action to be broken open with the cross bolt safety engaged which allows you to load or unload your Outfitter G3 and view the chamber.
This youth model also has a length of pull of 13"
Stay safe & have a great day!