The Firearm Blog has photos of OSS suppressor failing a Department of Defense test. It is unclear when this happened and in what context, but it adds another contention between the fight between two companies.
http://www.thefirearmblog.com/blog/2016/06/25/tfb-exclusive-dod-photos-of-oss-suppressors-allegedly-failing-official-testing/
Previous entries regarding the controversy:
OSS's press release claiming to have passed USSOCOM test, followed by SureFire's rebuttal
OSS's rebuttal to SureFire
From: The Firearm Blog
