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I have a factory circa 1999 Postban Bushmaster 20" barrel upper receiver complete with BCG and charging handle with less than 1,000 rounds through it. The barrel is marked "B MP 5.56 NATO 1/9 H BAR". The only thing needed is a rear sight and a lower receiver and you got yourself tons of fun. $425 in the Graham/Puyallup/South Hill area.