Without seeing a picture, it sounds like a Belgian Mauser. The book "Mauser Military Rifles of the World" describes a marking like yours for a Model 50 short rifle.:
"Manufacrure's markings on the receiver ring, or on the 1950 models, a crowned "B"/"ABL"/date. Apparently "L" marked specimens also exist.
Is it chambered for .30-06 with an overall length of 43.5 inches??
I recomend this book by Robert W D Ball for anyone interested in Mauser rifles. A fourth edition is coming out and Mr. Ball thinks that it will be available sometime in late November or December.
Steve
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