that looks to be a springer. if your not versed in rebuilding them and have the tools (IE spring compressor, etc) then give the user on here SHADOW a PM. Ed is the best tuner in business today. he learned from the best, and follows the best practices. the rifle will shoot better than it ever has when he is done with it.
Another reason i say that is... with a gun like that... you may not be able to get a spring/seal... where as Ed/Shadow, will have the means to have a seal made, or alter another seal... and springs he could find one to work...