I need some assistance please with some modifications I want to do to my new TPS.

Modifications I Plan To Do:
1. Replace stock buttstock with Magpul CTR stock
2. Replace stock pistol grip with : MagPul MIAD Modular Pistol Grip

What I need assistance with:
• Do I have to remove the buffer tube to remove the stock buttstock? (I need to measure the buffer tube to determine whether I need to buy the Mil-Spec or Commercial model). If not, how do I remove the stock buttstock?
• Is their anything I should be aware of through the process of removal and installation?
• What tools will I need to do so?
•How do remove the stock pistol grip?
• Is their anything I should be aware of through the process of removal and installation?
• What tools will I need to do so?

Thanks for your assistance.
Dr. C.