I say it depends on your playstyle. Someone who plays the stereotypical sniper (sits in bush and is sneaky AF) absolutely needs a TM mk23. I personally run with both a TM mk23 and a TM M&P9 (although a high cappa or glock would be fine as well, M&Ps are a personal preference). The mk23 is for sneaky encounters, and the M&P is for when I need to put a larger volume of fire downrange.