CZ Bren 2 MS 9 issues

CZ Bren 2 MS 9“ barrel problems. FTE, stovepipes, erratic ejections. First time shooting it. 0:25 failure to load 2:37 ejection ping pong (this happened many many times) 6:17 8:49 stovepipe 10:49 yikes (almost for sure an ammo issue) Ammo used: Tula 122 gr, Geco 124gr, Hornady 123gr, Inceptor 90gr, Wolf Polyformance 123gr About 300 rounds put through it on various gas settings with the above ammo. Ended up acting like a bolt action rifle on normal and adverse gas settings near the end, having to charge it every time. Sorry for the poor quality, range was dark and GoPros are bad in low light so I had to increase some of the settings. I’m going back later this week and will setup a light to help with the video. Any suggestions on GoPro settings would be helpful.