Damn!!!
Never saw that picture Shaneshac - that's one big Amberjack!
Personally, I don't feel confident in any of my customized Euro-guns handling that sort of fish... Definitely have guns that I'd feel comfortable using(Riffes, Wongs), but most of my modifications on Euro-guns have been for ease of loading, opening up the line of sight, etc. In fact, the Alluminum 120 I modified actually has 2 14mm bands instead of beefier ones. The main reason is that the gun is so light that 2 16's would over-power it too much & muzzle-kick like crazy. My dive partner just designed an euro-gun open muzzle with integrated band-elevators, so I'll see if that helps... More pool testing to come
As far as landing a fish of that size(not speaking from personal experience

), a lot of it really depends on the circumstances. In blue-water, it'd be a heckuva lot easier. All you have to do is get a lucky shot and/or play the fish right. Around reef... you probably need a little more knockdown power of a big Riffe/Alexander and a slip-tip would certainly help. Any little edge to keep that fish from getting down into the reef could make a world of diiference. While definitely not out of the question as far as possibility of landing a beast like that on one of my toys, I'd go for the beefier gun with a bigger shaft
Of course, if I was in the water with one of my customized guns, I'd certainly try :hmm