A BSA Sportster ID please. I've done a bit of research, mine's a straight barrel not tapered, small none adjustable rear sight that folds flat, the lever on the tap is straight with no tab area sticking out, i can't find the serial number, where did they hide it ??? there are 2 normal rail lines for scope mounts (i've seen 2 & 4 slots ? mentioned) plain stock no rubber butt pad, rear of the piston chamber slopes down like a Mercury break barrel & two slots on the forend one each side Ahhh light bulb moment maybe slots referred to the stock not scope mounting rails ??? Any idea where I can find the serial number & rough idea of age mk1 or mk11 & of course value approx in rough condition