Crosman Challenger - Good or bad?

[greglazor]

Hello,

Can some of our experts give me an expert commentary on the Crosman Challenger Sporter Air Rifle?I am not wild about the Air Tube, not being replaceable.What do you think of the AdJustments, Accuracy, repair record, Sights, etc.Is there another Rifle that a shooter can start with and transfer to Precision at a later time?Can a Anschutz Club Air Rifle be used for Sporter?

Please help.

I didn't find the right solution from the Internet.

References:-
http://targettalk.org/viewtopic.php?f=6&t=56914&start=0
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Thanks