There is a sawnoff shotgun that you can switch to, and if you look up there are some floating platforms, i would suggest saving ammo onone pistol, and use it for microajustment after using the shotgun to shoot yourself into the air. Hope that helps.
the cursor would turn red if your close enough, and then you press the same button you use to throw the gun, and it will swap, if that isn't working, then throw your gun away, and then press the button for that hand on the item.
