Why 60 Degree?
60 degree rubber is softer than normal 80-90 degree rubber.
It is much easy to install and operate the softer rubber bucking.
The B.B. will shoot out easy without headache and need less skills to upgrade
How to install:
(1) Please apply some oil outside the bucking when installing.
(2) If you have problems to shooting, please apply some oil "inside" the bucking.