Armstrong was selected by the Houston Rockets with the 23rd overall pick of the 2001 NBA draft. He was traded along with fellow Rockets draft picks Richard Jefferson and Jason Collins to the New Jersey Nets in exchange for the draft rights to New Jersey's Eddie Griffin. In three seasons with the Nets, Armstrong averaged 2.2 points per game. He only played 17 games in 2002–03 due to suffering from regular back pain. He was subsequently not on the 2003 playoff roster.
Armstrong became a free agent in 2004 and signed with the Golden State Warriors, but was waived prior to the start of the 2004–05 NBA season. Armstrong's final NBA game was played in Game 7 of the Eastern Conference Semi-Finals on May 20th, 2004. In that game, the Nets would drop the series to the Detroit Pistons by losing the game 69 - 90. Armstrong played for 4 minutes and the only stat he recorded was 1 assist.
For the 2005–06 season, Armstrong moved to Italy to play for Roseto Basket. He left the team in November 2005 after appearing in seven games. In February 2006, he moved to Spain and played 10 games for Calpe Aguas.

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