So I started the Van Graf quests line with the first being to help the guard with his shift outside the building. He gives you a energy weapon and armor, however after the quest whichever gun you had out previously is no longer in your inventory. Unfortunately for me it was the weathered 10mm pistol from the preorder so I no longer have one. I am not sure if it also replaces other weapons since I havent gone back and tested it.

any one know whats going on? did i simply miss something?

any one?

Nope never happened to me. I still have the weapons I already had, did you drop it by accident in the PipBoy menu? I did that with the Ghoul Mask in Fallout 3 and by the time I realized it I didn't know where I droppped it.