After removing the back lock lug, you could pull the striker, then the striker or cocking handle and spring which will allow you to get to the nipple and breech plug. I suppose you could remove the nipple and pull the breech plug and run a cleaning rod through the breech of the rifle towards the muzzle. I have never done that. When I am shooting I swab from the muzzle down with denatured alcohol and then a couple dry patches. The only time I break the rifle down is for the final cleaning. I have never tried it because the wrench that comes with the rifle is not the best piece of equipment I ever used, especially if you have a scope on it. (broke the breech plug wrench trying to remove a stuck breech plug and am currently waiting still for a deluxe breech plug wrench so I can shoot again)
All I will say for the rifle is, it is not that bad to clean once you have the breech plug removed, it seems to shoot almost anything I want to put down the barrel, and shoot it well. The trigger is fantastic, and the fiber optic sights are so nice I am tempted to remove the scope and mount it on the Staghorn I have and shoot this rifle with the fiber optic sights only.
This pic shows what you can do with one off shooting sticks with 85 grains of Triple Se7en, a wonderwad and some home made conicals. The one small hole was a 240 grain Cheapshot I fired off hand at the target after shooting the 320 grain LEE R.E.A.L. conicals...