Very occasionally, a high condition steel barrel Remington shows up on the market. They are pretty tough but not stocked for pigeons. An ideal pigeon hammer gun would be a medium high condition ten gauge Parker with chamber inserts, either permanently inserted or not. I have also seen ten gauge hammer Prussian Dalys with permanent 12 gauge chambers that would have been great flyer guns. Ten gauge Parkers and Dalys are normally stocked quite stoutly.