[eastdesign]

just bought a cartel x pert sight (i no not the best one but what with only just starting out i cant spend toomuch dough) and am wondering where i should position the exstension arm, should it be all the way out and secured at the end? or secured half way down? is this just going to be trial and error to find whats bet for me or does the position effect aim etc?

any help would be great