No problem. I have what was either an "A" or "B" grade that it's original barrels were no longer with the gun. There has been some fluid non-lugged baker barrels fitted to the gun and they work great. The person who fitted them, made the original ser. no. of the barrels disappear and added the ser. no. of the gun(6111) to them. Though the barrels are rather boring, not having the beauty of composite barrels ;), but they fit and work great.