My Rifle and Pistol sets are clearly combat movement sets, so this is not really a problem with those packs, but with the lack of casual sets. To have casual movement with guns in your game, you simply have to get more animation sets like that.
You can either wait until I make them, get them from other vendors, or hire a mocap studio to produce them for you. Or you can use IK (which looks decent and saves you RAM memory for 100 animations per weapon, which can sum up to 700+ anims in full game):
I know the footage is from Unity, but it ilustrates how IK-altered animations look like. You can do the same in Unreal.
