Add bow attachments.For example, you can add iron sights for the bow, or maybe even a higher magnification scope. For the magazine, You could make the arrows lighter, allowing for more range/faster arrow speed, or silent arrows, when hitting a surface. Or maybe even allowing for up to 3 arrows to be put on the bowstring. You could also modify the bowstring, making it give no sound signature from release of the string, or a more powerful bowstring that lowers movement speed more but increase damage on limbs and faster arrow speed.