In addition to the wierd breeching, the Crockett can have some real mainspring issues. I went through four of them on mine until I diagnosed the problem and seem to have fixed it. More than you want to know having never seen one, but there's a little "tit" on the side of the mainspring that's supposed to go into a corresponding hole on the side plate. Problem is, the hole is too small so the spring sits at a cant. There's also a guide groove in the side plate corresponding to a ridge in the spring, also for guide purposes I presume. But the ridge is too wide and drags on the spring as the spring flexes. Relieving the hole in the side plate and narrowing the ridge on the main spring solved both issues so the spring rides true now, but before that it was prone to breaking or popping off completely when you removed the side plate. The one time it didn't break, it blew a big chunk out of the stock just in front of the lock plate. Careful epoxy work fixed that.
These issues occurred after the gun was a couple of years old, and Traditions did everything but laugh at me when they started cropping up.
A friend who has one had a new problem crop up. The metal in his hammer appears to be soft, and it kept bending further and further out of alignment the more he used it, to the point it wouldn't fire any more.
To my way of thinking, it looks like there's a pretty good reason L&R sells replacement locks for them. Even at $95 a pop they're probably a pretty good investment.
Love the gun and used it lots, and maybe that's at the heart of the problem. It's just not up to 1000 or so shots a year for a few years.