All Co2 tanks will fit any gun meant to be powered by Co2.
Spyder threaded barrels.
Any Spyder threaded barrels.
Any stock built for the Tippmann 98 series, including the project salvo, alpha black and the non Tippmann BT4. A5/x7 ans spyder mr stocks will not fit.
I believe it is a5/x7 threaded.
3skull is a company that makes aftermarket parts for tippmann, spyder and smart parts guns.
Without specific marker models, It is more of a matter of opinion. The Tippmann internal design is much more durable, and simpler, where the Spyder design: (also found in all "spyder clones") the stacked tube is generally able to be faster and lighter.
No, they will not both fit unless you have it custom fitted.
it really depends on which marker you have. if its a tippmann or tippmann clone it is typically your power tube or sometimes the tombstone seal that is the issue, if its a spyder or spyder clone your problem has to be in the valve body or cup seal