Even if the scope is good, with a 2.5X scope, I have a hard time shooting my best groups at 100 yards with anything less than 4x. As for NC star scopes, I have two, one 4x on a 35 rem barrel that works just fine and the other is a 2x7 on a 22 K-hornet and it also works real well. Guess I've been lucky, but I didn't buy either, traded into them both as package deals.
regards,
graycg