What surprised me in the video was learning the slide is made from Aluminum. If it is Aluminum and it's die cast not milled, it's not surprising it failed. The Colt, (Umarex) AR-15 .22's are experiencing the same problem with the lowers. Many are cracking because they are die cast and not milled, and or forged. I don't mind cost saving measures, just as long as quality doesn't suffer to the point of hit or miss failure. Bill T.