I know this subject has been beat to death but I have shot them this season alone and have had success. Started to wonder though when the model I bought this year and thus am shooting was introduced on the market. I have been all over the internet looking and can't find and answer. Reason I ask is because I have some older ones that are slightly different that a buddy gave me and was wondering if they were all that much different. Was wondering if anyone could help. Thanks!! Pick a Spot, Stay Calm.