11 Polish AK-47 AK47 Receiver Flats Underfolder Underfolding Under Folder

Made by AK-Builder best receiver flat maker.
However ours are old stock with the correct stepped top rail. His current stock does not offer this option as his die has went bad for making the stepped lip.
Get them now as we have to destroy these after August 23rd due to new laws…
The Polish Under folder is the most popular under folder parts kit and this was the first specialty flat that I had perfected by modifying existing flats in 2004. Now they are stamped out specifically for the Polish Under folder from raw steel.
Receiver flat thickness= 1mm (.040”)
Material 4130 Annealed
Comes with bolt guide rails
Rails and flat need to be heat treated after bending
Recommended rivets and center support (not included with flat)
AKS Under folder Rivet Set
1mm Center Support
To use these flats you will need to have a 5mm and 7mm reamer. The physics of bending sheet metal make it next to impossible to have a bend close to a hole without distorting. To solve this the holes on the flat are undersized and need to be reamed to size after bending. Look at the receiver flat instruction page to see more info.
AK BUILDER POLISH UNDERFOLDER RECEIVER FLAT LOT OF 11