The feed neck threads are proprietary.
The ND breech with the screw in detentes is going to be released soon, but the Evolve breech is already available. The detentes for the Evolve breech are adjustable for ball size and hopper type (more detente for a Halo). Your stock breech is fitted with little rubber detentes that sort of snap in. They work ok, but they wear out. It won't matter unless you run a Halo. Since Matrices can easily rip at Halo rates, the Evolve breech is pretty handy.
Downside to all the after market breeches is that they have to be machined to fit with anti-chop eyes installed.
What sort of 'Trix you got?