Role: British section; gunner.
Expected behaviour: L86 working usable.
Actual behaviour: L86 throws an error, lacks the UI picture, and cannot be put in your weapons slot, and consequently the gunner is weaponless.
Additional information: Happened for Condoxy and Kapten_Nubben aswell. 

Weird, what's the error?

Lacking UI picture.

That's an annoyingly common issue arising from the JSRS compatibility, the game loads the config from a different pbo (ours) and therefore cannot always access the ui picture. That wouldn't stop it being used as a weapon though as we have the same issue known on all our SF weapons and they function fine. I'll look into it

Unable to repro at the moment with my limited time and both gunners currently online have working L86's. It's probably related to running JSRS, should be fixable but my time is being taken up with other things at the moment. I'll have a chance to get back to TWC stuff properly in about a month so I'll be able to take a proper look at some point then. Easy workaround is to run JSRS with the compat optional.