Some people think the nut has something to do with the quality. It is just silly...
SILLY.
Straight chambers and good quality barrels shoot. The nut has nothing to do with it.... except setting the headspace. These propaganda ideas that prefits are "sloppy", or are less than quality are total BS. Anyone who has done any machining will be speaking falsely if they say that a prefit is machined "sloppy". It is total BS.
Threads are cut to spec, threads cut straight, chambers are cut straight (some more straight than others), nuts are machined straight...
This is prefit. Think it won't shoot???
It is just another form of
SNOBBERY to badmouth prefits. That is all it has ever been. All it will ever be. Good is good, and junk is junk.
Lots of JUNK BARRELS that shot like crap had shoulders and were "fit" by a gunsmith.