Re: MR100 Need help with upgrades.
It all depends on just how much you want to put into it, then. A used CP regulator is an excellent choice, and they aren't too badly priced. An AKA 2-Liter is the one that most people pull out as the most consistent regulator out there, but I have no qualms about my AKA Sidewinder either. Bob Long Torpedo's (newer models are called 360's) are good workhorses. They handle both CO2 and HPA fairly well, but not the absolute best. They are perhaps one of my most frequent recommendations for a Spyder simply because it really doesn't need an extremely high performance regulator. In the end, it is a mechanical system, versus most electropneumatic markers that can have their ram throw finitely timed and tuned. Keep in mind that just about every regulator can be used on another marker down the road, so if you ever decide to change things up you can still use it.