I'm new to blowguns and I'm curious what the best .50 cal is? I'm looking at http://www.blowgun.com/shop/category.aspx?catid=16 and they have 5 for sale. With the exception of how many darts they come with they all look the same to me. Is there any differences other than that? What are your thoughts/reviews on these? I'm going to be using this just for taget practice, not for hunting.