The Indiana native ran two full seasons for the King in the XFINITY Series, earning one pole and four top 10s. His best finish in those two seasons was a sixth at Daytona this past July. He finished 13th in points this season.
Those stats weren’t enough to keep him in the car for a third season, it appears. RPM announced the split on Tuesday evening, a day following the season-ending XFINITY Awards Ceremony in south Florida.
The move leaves the No. 43 Ford Mustang searching for a driver for 2016. Potential high-profile replacements for Armstrong include Regan Smith, Brett Moffitt and David Ragan. RPM also has a developmental driver, Ryan Truex, looking for a full-time ride in the series.
Armstrong doesn’t have a ride locked up, according to Motorsport.com. Richard Childress Racing was named as a potential suitor for the 24-year-old driver.