If paintballs are rolling out of your Blackhawk barrel make sure your Rubber ball detent is intact. When worn out these will let paintballs roll into the barrel before being fired. Blackhawk detents have two sides and can be reversed to continue working.
Watch this maintenance video to see how to disassemble the Blackhawk to replace or turn over the detent. https://youtu.be/M2WwZx0_wBA