Hello there, Thank you very much for reaching out to us. I'm sorry to hear that you are having issues with the perk on this weapon. Just to clear up any issues that might be coming from your bindings, can you try resetting your control settings to default to see if the issue persists? If the issue persists, to help us investigate any underlying issues that may be occurring, can you provide us with a short video showing the issue? You can upload it to one of the media-sharing websites listed below: - [url=http://www.youtube.com]YouTube[/url] - [url=http://www.x.com]X/Twitter[/url] - [url=http://www.imgur.com]IMGUR[/url]