The Max D 6000 is a first generation Max D and successor to the XP 310. Max D stands for maximum distance, and the Max D 6000 makes good on that promise, shooting a good 4 feet further than the XP 310. This difference in range means that you can use the Max D 6000 in elimination games if necessary, something I wouldn’t recommend with the XP 310. Outputs are slightly higher, due to the Max D ball valve as opposed to the XP pull valve. Shot times have decreased from the Max D 6000 to the XP 310. This is in part due to greater output, but it’s also due to the 6000’s smaller PC/firing chamber capacity. It’s interesting to note, and also a bit puzzling that firing chamber volume decreased from the XP 110 to the XP 310 to the Max D 6000 even though the reservoir size progressively increased
Like other first generation Max Ds, the 6000 has a tough, durable exterior, but a weak spring going to the ball/firing valve. It WILL break after repeat usage. That is the major downfall of this weapon. This will render your Max D 6000 useless. There are 2 fixes for this that I can think of. You can replace the spring with any that you can find that will fit, and no one has been able to do that that I know of. Or you can replace it with multiple rubber bands. The pump is another weak spot on this gun, you should definitely do a pump reinforcement.
Ultimately, this would have been a very good gun if it weren’t for durability issues. To illustrate just how bad the durability is on this gun, my team had 4 new 6000s in 2003, by the end of the year every single one was broken. SEAL brought one to Downpour 2011, but it broke a year later. The Water Warriors Colossus is an all around better alternative than the Max D 6000 and I recommend buying one instead.