I still have the 2nd breechplug for my '02 Encore which is the deep cavity plug. I sent the original plug into TC and got it replaced to shoot loose powder and I got an extra plug for backup. So far it's shooting one hole groups at 100 yds so I'm keeping it till the groups open up. I have been shootin this plug for 6 years now.
The firing pin assembly gets cleaned after every range session or after the hunting seasons are over.