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Tony, it has 17″ barrel, 1 in 16 button rifled. Does not come in 20". Details here >>>> https://justrightcarbines.com/7268-2/?v=7516fd43adaa

Tony, carbine rifle has a 17" 4140 Chrome Moly Steel Barrel threaded 1/2x28 with a 1 in 16 inch Twist Rate. Cheers and stay safe!

1-16 is the twist rate and while the JR carbine comes.in several different models/configurations doesn't look like a 20" is an option. List of variants buds typically stocks https://www.budsgunshop.com/search.php/category/1817/type/Longguns