Updated QD sling points for Sillybutts Breacher

Print with the same profile sillybutts provides. Both parts shown in the photos were printed without supports on a Bambu Lab A1 and work just fine.

Sillybutts includes a few parts for the Breacher blaster that have QD points. However, these QD points are slightly too small. These files includes QD points that are closer to spec and actually fit. These cups also include anti-rotation posts to prevent your sling from twisting. 

This remix includes updated picatinny barrel front and catch holder parts.

Use the same print settings Sillybutts suggests when printing the parts.