Sterlings were originally small run custom guns, then "mass" produced by Proline, then the rights were purchased by Arrow Precision and the guns were changed slightly and mass produced for real. Arrow models can be quickly identified by the squared pump handle. Earlier models had fully rounded pump handles like this:

Customized Proline Sterling
What you have there is an Arrow Precision Sterling Bronze. It was the mid-grade version of the gun. They came in Rental, Bronze, and STP models. They're excellent guns with what is accepted by many as the smoothest pump stroke and fastest autotrigger of any out-of-the-box gun on the market. The feel is comparable to or better than anything out there - the best of sheridan and nelson all rolled into one! I love mine to death - I'll probably never get rid of it. ENJOY!!!
