Stock bolt from Piranha and Spyder, Supafly... Supafly is the same thing basically.
Spyder AMG, too many upgrades to list. 68/4500 REGULATED tank.
High flow, non-absorbant material, less friction, light.
Well, I don't know... can't think of any.
Ok, some people need a couple more years of experience and a little more knowledge about paintball because the last review was totally misleading. I have no idea what he's talking about. Don't listen to him, he only has 3 months exp. And to contradict another guy with no brain, delrin is known NOT to swell. You got it mixed up. Besides, the material is "self-lubricating". Meaning you don't need to oil it. Ever. It's very open to provide for a good airflow. Because it's plastic, the bolt is lighter than most stock bolts.
It's a pretty darn good bolt. Self-lubricating, light, high-flow porting. It's marked at a good price, too. I'd definetely consider it if I were replacing my bolt.