Lordgunner
it replaces your current 209 breech plug. The new breech plug will then allow you to load in a 25 automatic cartridge pistol shell casing, primed with a pistol primer. The shell is squeezed in to the end of the breech plug and creates a tight gas seal...
Here it is installed in an Encore... I personally believe that the 25 ACP system is better than the 22 Hornet that they offer.
Here is the web address>>>
http://www.prbullet.com/hornet.htm
.25 ACP T/C Omega & Encore breech plug
Nothing to trim. Nothing to fit. $ 59.95 includes 12 .25 ACP unprimed brass