Polish Underfolder Flat w/ Rails by AK-Builder With Y & I Embossing

Item Number: 1905
Price: $39.99
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These flats are made from 4130 annealed steel as well as the rails.  Some rails may be black oxided to prevent rust, but no rails will be heat treated when shipped. By AK-Builder

The Polish Underfolder is the most popular underfolder 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 Underfolder 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

Reccomended rivets and center support (not included with flat)

  • AKS Underfolder 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.

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