Originally posted by V
I don't think it is possible.
You'll have to just do a second run of the game if you want all the weapons.
The game doesn't work like that. When you restart the game you have to collect them through the game again.
It should be possible to memory edit the extra weapons into your inventory at an earlier part of the game.
Has anybody tried it?
It can be done with Nailbombs, Molotovs and Smoke bombs, that I know.
But I haven't seen anyone attempt the guns.