The stock is AGP Arms folding stock, got it from Spike's.
The comp is a Levang Linear comp. I turned the rear half down to retain the handguard cap in place.
You didn't ask, but the rail is an Armalite SPR rail unit that they used to make for a particular rifle/handguard combo they had...since stopped making them.
The sights are from an HK SL8-1
I am missing a screw for the front sight, and need to blacken the front of the sight rail were I cut off the front clamp and milled it square.