A bolt assembly for a paintball gun preferably includes a valve stem
having an output port that can supply compressed gas to a compressed gas
storage chamber. A bolt is preferably slidably mounted on the valve stem
to move between a forward and a rearward position. The bolt can include
one or more bolt ports configured to communicate compressed gas from the
compressed gas storage chamber to a forward end of the bolt for launching
a paintball when the bolt is in the forward position. When the bolt is in
a rearward position, the bolt ports preferably communicate compressed gas
from the outlet port of the valve stem into the compressed gas storage
chamber. A sealing member can be arranged on the valve stem in
communication with the bolt to prevent compressed gas in the compressed
gas storage chamber from entering a forward bolt chamber when the bolt is
in the rearward position and to permit compressed gas to enter the
forward bolt chamber through the bolt ports when the bolt is in the
forward position. A flow control member is preferably slidably arranged
on the valve stem and configured to permit a flow of compressed gas from
the valve stem output port into the compressed gas storage chamber when
the flow control member is in a first position and to restrict or prevent
the flow of compressed gas from the valve stem output port into the
compressed gas storage chamber when the flow control member is in a
second position.