I have been using a Win Model 1300 pump for decades. They don't make them anymore but you can get a used one for a couple hundred bucks. They aren't fancy and they aren't pretty but they go bang when you want them too even if they are wet and muddy and they come with various choke tubes. Mine is scratched, has missing bluing and light surface rust due to fresh and saltwater exposure but when I toss out the decoys this is what will be in the blind.