I had the same problem with carbon express mechanicals I’ll never use them againThe worst i never got a chance to use were from Carbon Express. Can't remember the model name.
Looked good out of the package.
Hunted 1 season with them.
All the rubber bands snapped. Then the screws holding the blades came out.
Fixed blades for me from now on.
Oh, and i'll throw in the G5 as second place.