All you ever need is electricians tape. This method is stronger than finger cots and stays put. Cots can be brushed off. Put a few extra wraps around the barrel or even around your kick pad. The "column of air" that is in the barrel will proceed the bullet down the barrel and break the tape long before the bullet gets there. Your point of impact will not be changed in the least.
Mark
"When there's lead in the air, there's hope."