The DAR-12 , cause Avia B-534 was equipped with a large number in Bulgarian Air Force, So converted B-534 from a biplane to a single wing fighter. The wings were derived from the B-135(DAR-11) equipped by the Bulgarian Air Force, and the wings and landing gear were produced by DAR company. The aircraft had two 7.92mm machine guns installed on the top of engine fairing , one 20mm Orikon MGFF/M after the engine. The original installation of the machine guns was removed, but the fairing was not large modified, so you can see the original places where the machine gun were install.
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DAR-12 Late, modified the engine fairing
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DAR-12, same with DAR-12, The appearance of the DAR-12 depending on the aircraft used for modification. cause the Avia B-534 also have I/II/III/IV series.
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DAR-13，modified in DAR-3 Garven Biplane to be single wing, wings come from Bulgarian Ar.196 A-3. one fixed machine gun in the engine fairing right side, two 20mm MGFF in the wings, one 7.92mm MG15 movable machine gun.
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