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Your best bet is to contact Thompson/Center customer service. CALL (866) 730-1614 OR email tca_customerservice@tcarms.com

Robert, according to Thompson Center, yes they will on both the Encore and Contender Frames. -- https://tcarms.com/pdfs/uploads/manuals/TC_Catalog_2ndEd_2018_Web_33_48.pdf

According to TC "FRAME ACCEPTS ANY ENCORE® OR ENCORE® PRO HUNTER™ INTERCHANGEABLE BARREL FOR MAXIMUM ADAPTABILITY" They also say "NOTE: ALL ENCORE® & ENCORE® PRO HUNTER™BARRELS, FRAMES AND STOCKS ARE INTERCHANGEABLE. WHEN YOU CHANGE OUT TOA NEW BARREL - A NEWFOREND MAY BE REQUIRED TOMATCHTHE CONTOURS OF THE NEW BARREL I.E. SWITCHING FROM ACENTERFIRE RIFLE BARREL TO AMUZZLELOADER BARREL - THE MUZZLELOADER BARREL HAS A CUTOUT TO ALLOW THE RAMROD TO FIT."