I got the Tokyo Marui AKX GBBR, and despite Tokyo Marui's reputation for quality products, I may have run into a lemon. I need your help to solve this issue. Is my Tokyo Marui AKX a dud? Or am I doing something wrong?

Timestamps:
00:00 - INTRO
00:30 - INTRO 2
00:53 - TOY OVERVIEW
07:45 - IS IT BROKEN?
08:48 - Troubleshoot 1
09:45 - Troubleshoot 2
10:32 - Troubleshoot 3
12:13 - CONCLUSION!