Really? You need to video that thing being fired. I've a centurion I've been working on "paint" wise. Great for a futuristic look, especially with a berrel extension, mock suppressor and illuminated scope.
Rather picture heavy this one as it was a bit of a major commission. The case was a first for GearTech but was certainly more work than I expected and took a lot more hours than I bargined for. Still it turned out nice and compliments the other bits.
For things like that you can use Maskol before you apply your final coats. When finished it rubs off revealing the colour underneath. There several techniques all of which modellers use.