I have some of the 94 flats that were made on original HK tooling for sale at $375 each and I have a simple pictorial on how to bend them posted on my site. These are correct in everyway and the rails are fully formed so the collapsable stock fits properly. They are easy to bend and weld into a usable receiver , Jason over at investment grade will bend serial# and finish them also . These are the closest to a genuine HK stripped rec avail and are cheaper than the ones from SW