As above, the water bottle in George's Barney also forces the bars apart slightly, but I wouldn't not buy it because of it. It's an amazing cage with great dimensions and quality for the price. I'm getting another for my new addition
One thing though - he struggles using the ramp it came with as there aren't many indents to grip on. I bought a hanging bridge from Zooplus (£1.99 right now) to use as a ramp instead and he's fine.