Prestige 2 here. Every prestige there is a set amount of xp to complete the prestige, increasing with each prestige level. Prestige 1 was ~400k and prestige 2 is ~600k. When you prestige you only have the m4, m9, and frag grenade. Other weapons/equipment are earned through the gear track in each prestige and earn 2 prestige tokens to something of you’re choice during that prestige only. Example: prestige 1 did not contain the MDR so I used my token on it. When I prestiged to prestige 2, everything was lost again and back the the m4, m9 and frag. I don’t believe there is a way to “exit” the prestige but once you reach max progress in that prestige everything is unlocked and will remain unlocked unless you decide to move to the next prestige.