I do like the pattern in pic#1 for an M4 and also the pattern in pic#4 on the Sig. Appears you did an excellent job based on the pictures.
No, I can't take credit for any of them, they're all done by an outfit in Wisconsin that I used for two jobs, my worn Sig P226 slide and the barrel for my HK SBEII, both done in black. Cool stuff though.