In September 2010, A Perfect Circle announced that they would reform and McJunkins was asked to join on bass alongside co-founders Billy Howerdel and Maynard James Keenan with Jeff Friedl and James Iha. In the following years, McJunkins formed The Beta Machine with Jeff Friedl and toured with Thirty Seconds to Mars in 2011. In January 2020, he announced he was touring with singer Poppy in support of her album I Disagree.
