That is the model he has, to update to a bolt probe you need the part numbers of a new one which is
HEREThey don't seem to have the table in the diagram anymore for some reason (I think that used to be on the price list portion, and so they could change prices they took that sheet off). As for who to order from, JG will most likely have everything you want but you will pay 4x as much for it and shipping will be higher. With Crosman small parts are $4 shipping and cheap, if you order a barrel (even a short one for some reason) they have changed to $11 shipping I believe.
Since it's lunch time and I have a couple minutes:
Barrel 1377-075 (.177) 1322-064 (.22)
valve assembly 1322A013
valve O ring 130-035
transfer port 1322A026
transfer port seal 130-036
plastic breech top part 1377-074
plastic breech bottom 1377-077
plastic breech bolt 1377A062 (.177) 1322-063 (.22)
small front breech screw 1322B027 (I'm not sure of the threads in your original tube, someone will have to chime in... modification or a tube change might be necessary)
bolt O ring 397-062 (.177) 970-028 (.22)
pump cup 760-140
It's been a while since I've ordered parts so I don't know current prices, I don't have the stock part number handy but I think it's 1399A01 or similar...