I started out with a T/C hammer extension on my Encore and had quite a few misfire (approximately 1 in 6 didn't go bang) so I called T/C and they suggested I remove the hammer extension!
I removed it and, "knock-on-wood", I haven't had a misfire since!
I just don't understand why T/C sells hammer extensions for the Encore, when they don't recommend using them! Makes no sense to me!