One of my favorite rifles also one of the ones I built in my basement. Yugoslavian AK47 (M85) in 5.56 with an AAC M4-2000 suppressor. I made it myself from a receiver flat in my machine shop. Lots of labor and engineering went into it. Probably a 50 hour project or so — lots more involved than building an AR.
Its so sexy looking wearing all black:
(2$ bill for scale)