Another one from the cupboard

Bought with a BSA L many moons ago as a job lot, don't know an awful lot about it, sling appears original, cocks and fires (weakly) although never put anything through it. Appears to be a strange BB? size.

Your thoughts.......




http://flic.kr/p/8Puk3V
http://flic.kr/p/8PumG8
http://flic.kr/p/8PxtP1
http://flic.kr/p/8Pxwyo
http://flic.kr/p/8Puu1V
http://flic.kr/p/8PuvGc