While building turrets i noticed that missiles will damage the base the barrel was docked too and the barrel itself (i guess this is because the latest change to explosions)
http://i61.tinypic.com/rws603.jpg missile damaging the mother entity
http://i61.tinypic.com/rkopk6.jpg the explosion from the missile also damages the barrel itself
Every other weapon (including damage pulses) seems to work as intended