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The tube was clean on mine. Their was some scale on the inside from the heat when they brazed all the components together but a few minutes with some fine sandpaper took care of that.
S&J makes some great stuff! My only suggestion to them is use a remington LE mag spring instead of the one they supply. I find the Rem LE springs stronger and thinner then the S&J one. Also the Remington LE spring allows the max cap. with out cutting the spring
I have bought both Mossberg +2 ext and jumbo safety off them and the quality on thoughs two items was top notch!