are those an option via crosman? Or are they aftermarket? What sites sell aftermarket parts for the 2300? Also can anyone explain how the power tuner works? Where are they available from?
The 2300 is on the 2240 base frame with the shortest air tube offered and the 2400 is based on the 2250 frame which has a little longer air tube by which the front stock can be added and is more comfort for a carbine. Both can be optioned as either a pistol or a carbine. The 2300 does not have the space for the front stock under the air tube. If you mod the air tube to hold pressure like hpa the longer tube will hold more air or co2.