If you load into an activity or reach a loading zone (these maybe the cause, I'm not 100% sure) your character and gun model won't load. This problem also can be seen in one of SirD's video titled "Strand Is LITERALLY Just a Meme..." at minute 5:46.
If someone at Bungie reads this, please fix it as soon as possible. It makes aiming weapons hard and can be problematic in Crucible. Thanks a lot
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I have the same thing. especially in the game for a few minutes. then it just stops loading the models and gives me the invis. i have to restart it to get the shizzle back to normal. i am on steam.