In the link below (which I found on this site) there are pictures with the subtitle, "Here is the Marauder with the Match Stocks as they arrived from Crosman. They balance perfectly and feel great." and it shows a stock that looks a lot like the stock on the Crossman Challenger.
http://ateam.100free.com/Crosman.htm
Is this available to normal people for the Mrod or just the A Team?
Thanks in advance.