can you guys help me to deciede withc way i want to go on this. i am not shure i am going to be up gradeing to the pst from the reg viper with mil. so i guess what the differnt. i have read the manual on both of them and the main dif i see is one is meters and the other is yards. if this is the case then i want the moa one. can someone tell me the diff is. thanks for reading and helping out.