Hi Wanabebwana,

You are right, the 400 and 300 actions produced by Polonsky had an FN type swept back bolt handle.
Here is a photo of a 400 model we got still wrapped in factory oiled paper.

The same action after blue printing, fitted with an Oberndorf bolt handle and a magnum extractor blade (after TIG welding of the notch in the guide)

What appears like a small lug behind the extractor is the guide rib portion that is not covered by the standard length extractor blade originally fitted.
Notice that if the bolt is of the same diameter than the Mauser, all other parts of the receiver are beefed up.
The bolt handle comes from a machined drop forging blank and is integral with the body.
Thank you for your interest.

DORLEAC
www.dorleac-dorleac.com