I currently have seven Nesika actions.  4 Js and 3 Ks.  Never an issue with any, and coupled with uber reliability and accuracy -- all are pretty smooth operators.  My oldest one is from year 2000.  If you bought a Nesika that was made up to year 2005, you are good to go.  Those made after that year are the ones that folks throw a gray cloud over.  I don't know; but there was a myriad of staffing and company turmoil going on in and around year 2005; and the focus from Nesika seems to have all but evaporated.  Pitty! Very, very, very high quality actions and the rascals are TOUGHER than nails.  I shoot 6BR through 284 Win with these.  The bolt handle and body are manufactured from one piece of steel.  I also have BAT SV and B actions, and one Stolle Grizzly II.  If you build a rifle on a Nesika action, including the Borden/Nesika TPE action -- a simple clone of the Nesika J action -- you will be very well pleased.  I would buy another one at most any time.  If you buy one, perhaps you should order a firing pin spring from Jim Borden and a bolt disassembly tool. BTW -- Nesika made a few complete rifles as well, with phenolic resin stocks.  I doubt you could find a rifle today with a better bedding job.  Good luck with your project.  I hope you find some of this helpful.