The 25 acp plug is a new breechplug which takes 25acp
pistol brass primed with a small rifle primer.The small rifle
primers are cleaner for me.The new plug also has a hex
face for easier installation/removal.I find the NEF plug
setup to be a pain,especially with their joke of a tool.Even
if you don't already reload,the tools to prime/deprime the
brass is inexpensive and very easy to deal with.This "upgrade"
has turned my sidekick into a whole different gun for me.I
even get better groups with the small rifle primers.I shoot
my ML's alot,so the initial cost was worth it to me.The new
breechplug costs $60,but 25 acp brass is cheap and the primers
are as well.The plug is sold by PR Bullet.Hope this helps.
Gary
ps:With this plug,the primer carriers are no longer used.