I started when I found a deal on a 2300s on ebay, with an accessory pack, which was box of 25 CO2 carts, tin of pellets and oil for way less than normal asking for the gun. It really got me interested so got a 2240, upgraded to steel breech and the trigger was so bad I got a supersear, roller trigger and Crosman adjustable sear spring, I next built up one somewhere in between, but got the parts for the Crosman 1701p two stage trigger nice but not as good as the supersear. I'm honestly afraid to add up the cost. and it's about to get worse. My 9 year old grandson shot them over Easter weekend and wanted one , so am accumulating some upgrade parts so I can make a couple of nice ones for him and his father. I do know I want a steel breech, so do not know at this point if I want to start with a 2300t, in .177 or go the 2240 and replace breech, I am thinking replace the breech as it will be longer, I will most probably keep them in .177 cal to keep pellet cost down.