My Yugo M64 kit. Not too many of these floating around, they were the first of the Yugo AK's, with a milled receiver and the two tang stock system like a Russian Type 3. It only has one horizontal lightening cut, on the right hand side, but it has a stepped down lightening cut on the left side of the receiver and a spring loaded piece to keep the magazine from wobbling.
And my Mitchell Arms imported Yugo underfolder. All Yugoslavian........
Before I changed out the gas block:
And after the gas block was replaced with the grenade launching sight block: