Jim,
Its not in our weapons cabinet at The Parachute Regiment & Airborne Forces museum at Duxford which is vast and glazed on four sides, we even have Saddam Husseins gold AK47 seized from his Palace on the liberation, be nice to know where the rifle ended up, where is it mate as its relevant to U.S Forces on Op Market Garden?
The Germans did take away alot of weapons on Crete, can't see any airborne there in that phot by insignia!