MIni - Morphine Bolt, Freak BArrel and 70/45 Stubby
Delrine = Light. Soft Foam touches ball with Love
None - Better than stock bolt in every way.
This bolt is an absolute must. Soft foamy tip to kiss the ball right out of the barrel. Little to no friction on the internals like the stock aluminum bolt. Eliminates any sort of kick that one may have been experiencing with their mini.
Orange is a cool color. Bolt is much lighter then stock bolt.
I have found that my mini started to chop .Lower the dwell by 8 to 10 points. I would bet a booger that it works for you. All of these derin bolts are much lighter than the stock and the dwell must therefore be compensated for.