I think in the BW film the troops may be early BGS as they still are employing the American helmet. The gewehr's are the FN manufactured G1 Model "a" with the H&R designed T48 type wood handguards and about only 2000 were produced for field trials with the BGS. There is no record that I know indicating the BW was issued with the G1 Model "a" FAL, but with the global distribution of various configuration FALs you can never say anything is absolute.
Also in the series of G1 models, all gewehrs were completely manufactured by FN and none by German manufacturers. The only metal part manufactured by Germany was the later replacement spring retainer/locking flash hider.
Top: FN manufactured flash hider.
Lower: German manufactured flash hider.