really, you don't need any upgrades. This pistol is supposed to be just that, a pistol, not a pistol conversion into a rifle.
Accuracy, heavy enough to feel real, doesn't bust paint
Manual stinks, make sure and download one off of the Armotech site
This gun kicks the crap out of every other pistol on the market. People might want to buy really expensive pistols, but that's not very intelligent because they could just get a rifle that is much better for the same price. Likewise, people like to buy PT Extremes because they are cheap, but that's just the problem, they're cheap and either break or cut your fingers to pieces when you try and load and cock them. The Zeus G2 splits the line of value and quality perfectly, and is the best of both worlds. This gun is a wonder, yet will not break your pocketbook when you buy one. Just make sure and shop around for the best price you can find, because some dealers will rip you on the price. And make sure that you buy a holster for it, it looks really stupid to be carrying this around in your pocket.
On all of my other reviews, I have said that no product is perfect and deserving of a 10. But for this category, I think that the Zeus G2 is as good as it will get, and all others will be left in the dust. 10 out of 10