The tubular magazine springs are available in three lengths: 40, 45 and 60 inches.
The 40 inch spring is suitable for all Briley extensions up to plus 6. The spring may
require trimming on some of the shorter extensions.
The 45 inch spring is recommended for use in the regular plus 8 carbon extension.
The 60 inch spring is recommended for use in the longer dedicated 12 shot or
more extensions.
These springs can be trimmed to reduce the amount of force
required to insert cartridges into the magazine however it is recommended that
they initially be used in their full length as they will take a set thereby reducing
their overall length. Trim in small amounts. A spring that is too short will not
eject the last few cartridges efficiently out of the magazine resulting in failure.