Hello there, Thank you for reaching out to us. I'm sorry to hear that you are having trouble accepting the Arms Week event quest on your other characters. We have received reports of this and are investigating any issues that may be occurring. For any updates on this issue, we recommend viewing our [url=http://www.x.com/Destiny2Team]X/Twitter page[/url] and our Patch Notes as they become available, posted on the [url=https://www.bungie.net/7/en/News]News page[/url]. Please keep in mind that the Volatile mod (ShatterShafts) should still be equipable on bows using your other characters once the questline has been completed on the character that initially accepted it.