i am leaning towards 2 different bolts right now and want your opinion. first bolt is the Mr.T derlin bolt because it just looks well designed and better quality than alot of the other bolts out there. bolt 2 would be the NDZ bolt with the spring kit because it comes with spare o rings and different springs to adjust it. for the people who have these bolts i have seen that you can adjust the air going into the gun from 200psi down to about 125 psi, is this true? and how much more consistant is your gun compaired to the stock bolt? also do you have to adjust the dwell or can you just leave that a stock setting after bolt is installed? thanks for your opinions!