Since this bolt has no o-rings, it causes a lot of blow back.
Reason why I dont like:
When you install the Orracle bolt, attach your air supply to your marker. Put the palm of your hand just above the back block (Dont put your had too close or else it might get caught in the back block when it recocks), and pull the tigger a couple times. You are going to feel a pretty decent puff of air come out the back block (Blowback). This will cause your gun to use up more air because of this. If you dont mind that then go for this bolt. If you want a more air tight bolt get something def with the delrin, but also with o-rings to prevent blowback.
I do not recommend this bolt. I recommend the Worr Blade Bolt by WGP. This is an all Delrin bolt but it has o-rings to prevent blowback.