Bow rig

In this rig we had create a bow and arrow with space switching.

• here I first created the  polygonal bow and arrow model and for the bow part I added some joints with two ik at each end as per requirement, and skinned it to and model.
• for the string I created cylinder with 3 subdivision hight and added cluster for those set of vertex 
• then I created two locator for each end and frozen the transformation and I made the locator parent of both ik and the cluster 
• now almost your bow is done, using space switching I parented the arrow with bow, bow string and the null group

hope like my rig test video

Thank you