Crown Continuum Barrel assembly question

There is an end cap that simply acts as a cap (doesn't touch actually barrel liner) and ldc adaptor. Glued and threaded onto the end. There is the sleeve, which has loctite and threads onto the liner receiver assembly. The liner is held into the receiver with a lock nut. Liner has 3 round plastic spacers that slip over the liner with orings on the outer edge that aligns the liner with the sleeve.