The A&D Body Action resembles a Lepage Liege( Manufacture darmes LEPAGE ), which was on & off w/ J. Kaufmann. Gustav Genschow & Cie (Socite Anonyme)
Berlin(Allemagne) et 527, rue Hayeneux, Herstal, had a Berlin address as well as on in Herstal for sourcing & odd tube steel variants like GECO Stahl, M.G. Stahl, Nickel Stahl, etc. appear:

http://www.littlegun.be/arme%20belge/art...%20cie%20fr.htm

Might see who else was located @ 527 rue Hayeneux, Herstal & get an idea of the manufacturer. But that spanner type retaining screw on the toplever is seen on Pieper's wears I believe.

Cheers,

Raimey
rse