full metal jacket
English
Noun
full
metal
jacket
(
plural
full metal jackets
)
(
firearms
)
A
bullet
having a
complete
covering
of
copper
over the
lead
core
.
Synonym:
(
initialism
)
FMJ
(
firearms
)
The
metal jacket
itself, which covers the
lead
core
.
Derived terms
full-metal-jacketed
See also
jacketed
metalclad