I figured out how people lose there guns and how to get them back.  Some of you may know that I lost my guns recently and took me about 4 days to figure out how to get them back.  No Sense of calling microsoft or relic because they cannot help. The issue is even harder to explain then how to fix it but i will try my best to.
   The issue is with the your profile not being signed in to the game once passed the main menu.  If you get past the main and then you sign in and it doesn't bring you back to the main menu then this is where issue will arise.  Once this has happen the menu screen is glitched and you can sign any profile you like with out going back to the main screen. This becomes an issue because it will remember the profile prior to signing in which is a temp profile that has no upgraded weapons.  And it you have the meu glitched and choose a insignia then the profile that is now signed in will sync with the previous one. This could be good or bad.  This leads me to how i got the guns back to my account.  I made sure i could sign in and out with out going back to main menu.  Signed in with a account that has all the guns( you must be signed in proir to going into the insignia screen with the account that has all the guns. Then sign out while in the insigina selection area and choose the account you want to transfer the guns too).  I signed out of that profile and signed in with the profile that i needed the guns for and chose the insignia.  And just like that it synced me to that profile.  I know this might not make sense to all or may not be explaining it the best, but if you have questions let me know and i will try to help.