Intellectual Property shenanigans between Thales & Madritsch about a trigger mechanism designed to overcome the unlocking of the 5.56mm bolt when an attached 40mm grenade launcher is fired.    Paragraphs 6-19 describe the mechanism & the problem.    https://archive.sclqld.org.au/qjudgment/2021/QSC21-170.pdf   The Cliff’s notes version:   https://www.australiandefence.com.au/news/nioa-wins-case-against-thales-over-misleading-and-deceptive-behaviou