I experienced my heavy weapon machine guns disappearing today.

Done this twice with good pistols. I really wish locking a weapon prevented you from deleting or rerolling it.

I've done that. Accidentally switched to another purple and ran the thing not realizing I had Purple gun X equipped instead of Purple gun Y. It's possible it was a bug, or you just messed up. Having a friend witness it might as well be "a girlfriend from Canada, but she's not in this school so you wouldn't know her." Or in other words, a possible fib. In any case, they say they will not restore any lost gear due to human error or bugs. Because as I posted below they'd have to handle tens of thousands of these posts every day A) I messed up and clicked the wrong button, can you restore my gear? B) The game or iphone-app glitched, can you restore my gear? C) Your game glitched, can you restore my gear? When it fact it was really them making a mistake and afraid to admit it D) Your game glitched, can you restore my gear? When in fact they sharded it, used the motes + mats to change something else, and now want their gun back E) Your game glitched, can you restore my GHorn? When in fact they never had a GHorn F) Your game glitched, can we talk? They're just lonely.

The Gunsmith works as intended. It could have been possible that you forgot to switch over to your Zero Point, and began reforging your Hopscotch Pilgrim by mistake, without noticing. Regardless, really sorry to hear about that since there isn't much that can be done, as Dan mentioned below. Always double check what you're doing when it comes to working with your items - especially while reforging.

No video, don't know how to record gameplay, but have a friend that was online to witness.