Yours has two wedge pins your saying? To remove the barrel knock out all the way both wedge keys. Remove the ramrod as well from the thimble rib as this can hold the barrel in. Then cock your hammer all the way back off the nipple or if its a flintlock, cock that flintlock to move it off the frizzen. Now grab the barrel in front of the wood stock. Lift straight up. You CVA might have what's known as a button breech. Its still a hooked breech but looks a little different. The button on the end of the barrel goes in and under the lip of the tang (the part that is screwed to the back of the stock that the barrel locks into).

After you have the barrel off, its easy to clean. Wipe it down on the outside with oil. Take a Q-tip and put some oil in that and be sure to wipe inside the tang lock hole. That can rust. Pay special attention to the back end of the barrel and don't miss that. When your ready to put the barrel back, just reverse the steps. Put the button in the tang and as you move it down it will slide back ward into the tang and lock in there as the barrel moves down into the stock. If you done it right, the barrel and tang will close real tight and the barrel can be put back into the stock. Kind of squeeze the barrel to the stock and replace the wedge pins, ramrod, and your have re assembled it. Be fore to close the hammer or cock on the flint lock to take the pressure off the springs when you store it. And then wipe the outside of all the metal parts off and your done.

CVA does have on line manuals you can download in PDF format.