Id say go for the KING ratcatcher rather than just the ratcatcher, the difference being the air source, the first runs on the little co2 catridge, bout 20 or so shots then change, where as the king gives you the larger bottle on the back which will give you around 200 shots, search the net, theres quite a few places doing really good deals on a complete set up, silencer,laser dot,scope etc
for feral pigeon clearance inside buildings these are great little guns and will take out rabbits too if your close enough, which will help you get better in your field craft skills,