I remember at the 2009 Barrie Gun Club M14 clinic, several members showed up with their 2009 Norc/Poly rifles. Most of them were bought from Epps in Orillia. All their flash suppressors just slipped right off

and I was super surprised because THAT is the way they are supposed to slide off.
* Loosen / back out castle nut set screw with 1mm or 2mm or 1/16" allen key (all depends what fits)
* Take castle nut pliers (righty tighty, lefty loosy) and loosen castle nut a few turns
* Hard plastic hammer & block of wood to the bayonet lug (or the stub/bottom of neutered lug)
* turn castle nut some more
* Whack FS with block of wood & hammer
* turn castle nut more again
* repeat until the flash suppressor slides off the 3 splines on the barrel.
Hope this helps...
Cheers,
Barney