you should bite the bullet ad ship for free if it is missing parts. you might get higher bids. i would bid higher if it was free shipping and then get the partis. it is not worth it now.
how do i ship it free the only way i can think of free ship is a mid size bubble envlope an take it apart so the pieces r small enough to fit the envlope plus the only part that is missin is the sling an i know they cant be more than 2-5 bucks to replace an also its kinda hard to ship an replace stuff when u aint got a job