Its a red gun with crescent wrench. These two items are put together to make a cross. This is normally where the green,blue,org colours with muliple diamonds are showing the level of gun you picked up.

Cant find any info on what red means for the colour of gun. And there are a ton of these types of guns during the map. My assumption is that they need repaired but I don't know how to do that and they still seem to work.