So are these British rack numbers on a Gew 98

I would lay even money on these markings being French, 2-to-1 on them being Belgian.

The BL could be Bataillon Legere or something similar, which, in English would be Light Battalion: backwards.

I do know hat the Belgians had a batch of P-'14s converted to 7.92x57JS in the 1920s; this one would have fit right in.
 
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