Heavy Armor Specialization

[x3m3]

Does this "Heavy Armor Specialization" stack with "Dwarven Defender damage reduction" Or any other ?
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Heavy Armor Specialization
Type of Feat: General
Prerequisites: BAB +12, Heavy Armor Proficiency
Benefit: When wearing heavy armor you gain damage reduction 3/-.
Special: A fighter may select Heavy Armor Specialization as one of his fighter bonus feats.
Use: Automatic.

[Luna]

No it doesn't.