 In 2015, it was revealed that due to budget cuts, SEDENA would not be able to meet the production rate of 121,000 FX-05s by 2018.On September 16, 2016, the Mexican military unveiled a new variant of the FX-05 known as the Xihucóatl Submachine Gun alongside an indigenous underbarrel grenade launcher made for it.On April 2, 2019, a new variant known as the PAX-100 is due to begin production.