Sounds legit to me, pics would be great. Several battalions of The King's Own Scottish Borderers were at Gallipoli, and that's very likely how the rifle fell into Turkish hands in the first place.
I certainly wouldn't shoot one though.
"If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or your arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that you were our countrymen." --- Samuel Adams