I ended up buying an upgraded B3 from some guy on another forum. As you know, the Cummins B3 can be a very nice gun for $20, but they also have their share of problems. Most of these are just due to bad assembly or seals.
Well, this guy disassembles the whole gun and tunes it. He polishes every metal part, conditions the seals, installs a heavier spring (optional), etc. Many people have bought these models from him and reported quarter sized groupings at 50yds, ~725fps, and smoother cocking effort.
He also refinishes the stock with stain or bedliner. I bought the bedlinered version because it looks pretty cool and will never wear off. His prices are unbelievablely affordable. Send him an email:
guru1@charter.net