Hi Tom, the accessories for the '99 will fit the CP sport.

What you have to bear in mind with the Sport however is that it is S/A only - you cannot pull the slide back to cock the trigger to it's second stage for D/A shooting like you can on the CP99. Throw in a truly dreadful trigger with a length of pull that seems about half a mile long, and what you've got it a fun tin can fast-fire plinker, but not a terribly accurate CO2 pistol - hence the difference in price between them.

CP99s come up regularly in the sales section, keep your eyes peeled and you could have a very nice little-used example for around the £80 mark.

I've got both and trust me, the '99 is in a completely different league - the Sport never gets a look in these days. Perhaps I should move it on.