Thank you, yeah that thing was a really nice build, never did get to use it in anger.
I would say the only thing needed is the hammer, the AA one is better for a "perfect" fit, the CowCow one is a touch cheaper but has fitment issues with the Mamba uppers if you ever strayed that way.
Other that that, nothing is needed on these pistols. They'll happily hop up to 0.4's out the box with no mods. Sure you can upgrade the barrel for small % improvements in grouping at range and you can stick H plates under the hop arm to hop heavier ammo and you can short stroke for a mega ROF. None of it is really needed, they are a fantastic pistol......kinda makes me want to buy one again.