I have an older 14" Craftsman bandsaw that I bought new 20 years ago. I believe it has a 1 hp motor. This thing has cut up countless bow staves and logs, many of which are harder wood than maple, and it shows no sign of slowing down. I put bearing guides on it which is a huge improvement over the guide blocks. It'll do well for gun work but I wouldn't go any smaller.
Other manufacturers make almost the exact same thing, so keep your eye out for 14" Deltas, Jets, Rockwells, etc.
Watch your local Craigslist ads, sometimes they show up on there for a good price. I got about half of my shop tools from Craigslist. Sometimes folks have big plans, buy big tools, and they go almost completely unused... eventually they're just in the way and you can buy them for half the cost of a new one.