Hey guys, I had a 9" Bren 2s in 7.62x39 that I eventually sold to fund a B&T APC 223, which I'm glad I did. Anyway, the Bren 2s never had any reliability issues at all and all ejection patterns were ejecting and landing in the same spot (no erratic ejection patterns). I missed the Bren 2s so bad I purchased another Bren 2s in 7.62x39 but in 11". I haven't run any ammo through it yet but all I have is Wolf polyformance and it worked great through my 9". I think this might be a Bren 2Ms issue with improper quality control from the US because the Bren 2s hasn't any any issues what so ever as long as you don't mess with the torque specs and mlok rails. I easily put 500 rounds through my old 9" bren 2s prior to selling it.