Electro Optic Systems Holdings (ASX:EOS) said it has demonstrated its R400 Remote Weapon System integrated onto an unmanned surface vessel developed by BlackSea Technologies, according to a Thursday statement.

EOS Defense Systems USA is a mission partner on the vessel, providing the gun system as part of the vessel's configuration, alongside partners including Lockheed Martin, Echodyne, and Current, the statement added.

The company said that the integration demonstrates how rapidly the R400 can be adapted to new platforms, moving from concept to live maritime demonstration in a matter of weeks.

The demonstration is expected to support further testing and operational assessment activities, the company said.

The demonstration also creates a new pathway for engagement with US Navy stakeholders, as it has been deployed on an unmanned surface vessel in the US for the first time.

The company's shares fell 5% in recent Thursday trade.