On a new gun, if your going to be using HPA you have to convert it (very easy), setup the fps (very easy), and the ROF (which can be challenging, if your going for the sweet spot)
Then you need the 3D printed nub, as stock it's not that good ... Also the stock barrel isn't that good
I know that all sounds bad, but trust me, it's more then worth it, and once set your gold
I got my Tippmans upper receivers tapped so I could run a TDC hop, worked a treat. I have a friends who's a machinist who can do a great job which allows standard nub stabilized from the top or full tap with a modified grub screw and flat nub