NERF Sledgefire Sling Mount optimized

I took the great sling mount by ValourLionheart and optimized it for printing:

-tabs printed separately and fixated by M3x20mm screw
-removed edges that needed to be sanded down

The Sling mount can now be printed lying down flat with little to no support, the tabs will be screwed in later, which also means they get printed horizontally as well which makes them more stable.