I just got a message about a loyalty reward, a platinum Bishop 600 shotgun.  Anyone else got this?  What did I do to get this?  Are there any others (ie, have I missed any)?  Member Pgacol noted something similar just under three weeks ago but perhaps that was the gold edition.  One other thing I didn't quite get was that Forge and so on appear in the main game, they're not standalone, but that was probably just me being thick!

It's just a fancy skin for the Bishop 600. It's supposedly a "community reward," like the ones they gave out with Rise. It should be in the weapons menu at base camps, provided you've reached a point in the game where you've unlocked at least one shotgun. The gold ones were rewards for following the various official social media accounts, again just skins for existing weapons, so no actual gameplay advantage. See here for details.