Spires are great, but expensive. I got a white one, and it stains due to the matte finish. Black ones don't have this issue. They are also great on batteries, as they only move when you shoot or shake your gun, rather than Rotor or Z2. But again, it is an expensive option. If at the end you are getting a mechanical marker, almost any hopper will fir your gun.
Edit: I just forgot a detail. Spires don't like this mini sausages, that your mates can put into your hopper to have a laugh!!!
Edit: I just forgot a detail. Spires don't like this mini sausages, that your mates can put into your hopper to have a laugh!!!