I literally think that model spyder is the worst to mod #1 reason being the stupid female threaded gas thru and male threaded VA. Like poster above said the purpose is to have a cheap modded gun. Well just cuz of that if you want to go LP or add any type of front grip (X chamber, reg, gas thru...) then you have to change the VA which adds $40 to the project even if you already have an existing reg to use. The ACS bolt is great tho and with rec balls I didn't get many chops. I would keep it HP run it semi with a low rise feedneck, mod the striker yourself, keep stock bolt and maybe change drop and add an aftermarket barrel. If you start going crazy it will cost way more than its worth.
Evil PIMP ghetto 7.0 rampin board, black cp reg , silver kila detents, low rise feedneck, critical trigger