Bind your weapon, you probably did that as normal, open up the infinite warfare conversion rig to t7, drag and drop your gun into it, then under your weapons joints it should say j_gun with probably a huge name before it. if so thats fine, then go into t7:joints->tag_view->tag_ads->tag_torso->tag_weapon_right and then go back to your j_gun under your guns joints and click on j_gun and the middle mouse click and hold on j_gun and keep holding middle mouse while you drag it up to tag_weapon_right and let go. Then dont select anything so click somewhere else on the outliner where its grey and in your downloaded iw7 to t7 conversion rig folder where you got your conversion rig for your hands open up scripts and drag in the iw7 script or the thing that doesnt say t7, save the scene where you want name it something like (weapon)_rig and then drag and drop your animation in if its a .mel animation and then drag in the t7 script in your iw7 to t7 conversion rig folder that shouldve helped...