You dont lose anything when you prestige. you will get to keep all your guns..
David Vonderhaar: "Weapon levels are given after unlocking a gun that was leveled up on a past level progression. That's what we call NAB. Not a bug. If you Prestige and unlock the gun, you'll pick up right where you left off."
Unlike Mw3 and previous CoD games. Nothing will be reset after Prestiging, Everything from you Challenges to your unlocks will remain.. This was done to encourage players to take the prestige challenge.
In the post you put only say camo attachment level ect, but the item the gun it self for a mather of fact does get lock i seen video of people prestiging and gun perkk equipment lock and you start again... That i know that that when you re unlock the item the level stay my concern is if they get block again when i prestige re need to use token on them so by doing that... Wont never have all item.?cause ill be aleays busy unlocking sane 55 when i prestige