the ports at the rear of the barrel had burrs, when we broke it down and snaked it you could see a total birds nest every time ... the dealer said he "lapped" them, he also stated before I left that if it didnt work he had a plan b in mind but he didnt say what plan b is/was........whether he did or didnt?? or swapped barrels??? I havent a clue, all I know is its fixed...need some black dog magazines now!!! fixing to go load up and head back to the range and put some miles on her!!