I know that ghost ring sites are illegal for IDPA. And the rule book basically states that any standard configuration open rear sites are acceptable. What about half ghost rings? I saw a couple of sets of this type site in the Brownell catalogue. I asked around a bit and got conflicting answers.
As a side note, I am not looking for an advantage in an IDPA match. I wear bi-focal glasses and have a hard time with keeping my focus on the front site.
Tucson, Arizina territory