What is this ,its different

[M1903Guy]

A complete SWAG (Silly-Wild-***-Guess) but perhaps the slot in the trigger guard was intended for one of the various versions of the trench rifle contraptions. The scope mount attachment appears to be an S & K no drill scope mount they make for 03's.[ATTACH]Attachment 98796[/ATTACH]

Information

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[browningautorifle]

the slot in the trigger guard was intended for one of the various versions of the trench rifle

It sure does look that way...

an S & K no drill scope mount

Yes, available for a number of rifles.