So this is my side project No. 2 (the first was my shotgun pistol). It can fire a bolt or either a connector piece. Its looks pretty cool too. Here are the Pro's and Con's. If asked I might post it I'm not sure. Enjoy.
new handle angle
Strong trigger (rachet)
2 firing ways
compact (as much as a sling can be)
Stockless (one was going to be added)
It always shots be can sometimes be unaccurate