This is the tang screw (stock screw) Winchester 1890 Special or the 1906 EXPERT pump .22. It is longer than a standard tang screw, and attaches the wood pistol grip stock onto the receiver. If you do not know if you have the 1906 EXPERT, take a look at the upper and lower tangs on you trigger guard. (the two pieces of metal that extForearm back from behind the hammer and trigger that fit into your stock) If the bottom tang curves downward and away from the upper tang to follow the downward curve of the stock, then you have a pistol grip.
