Hello all, I am new to the hobby and new to the site. I just picked up a CVA .50 cal Hawken with a 32" barrel. I say Hawken because that is what the seller called it. On the barrel is written " 50 cal Continental Valley Arms Inc. Black powder only Made in USA. I will post some pics soon. My question is on the cylinder that the nipple screws into is a screw on the end. Is this a clean out screw or does it serve some other purpose. Because I do not know the nomenclature for the part it is hard to do a forum search. Any information on CVA and the gun would be much appreciated. Df.