Just received my new Crosman 2300T today and after looking it over I attempted to mount the supplied rear sight. No go! They, believe it or not, supplied it with the wrong size Allen wrench Called Crosman and they are to send me a correct one next week. Any one else have the same bad luck? Anyway this is my second bad luck with new Crosman pistols this week. The first bad one I received this week was a new 2240XL that leaked quickly. Hopefully the replacement will be better. Charles