This is a charm holder, for your picatinny rail. This design is influenced by a design I found on thingiverse, but was recreated, along with a few refinements added and a different styling applied (chiseled vs rounded edges).
.Zip contains - .STL File - Read_Me.PDF - Render
LBRY Tags: charm; ar15; 3dprinter; picatinny; 3d printing