Your best bet would be to look for a Hastings rifles barrle Thu are made in France and are a lot better then anything Remington made. I have one I the wingmaster high gloss finish and love it.
Mine is 24 .I believe.i will double check. Fully rifled
Does Remington currently offer a 20" fully rifled - rifle sight 12 gauge 870 barrel with ball detent ?
All I'm coming across doesn't have the ball.
Are you going to use a mag tube extension ?



























