Mordekaiser and Gunblade

Well, since the new trinity force just seems way too gimmicky to build on Morde I started using gunblade instead. The shift from spellvamp/Lifesteal to simply 15% of the damage dealt makes the interaction of its passive and Morde's Mace of Spades kinda shady. So, long question, short answer; Does Morde's Q proc the full 15% heal or am I just imagining things?
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