I honestly did not consider the magazine and Kelly didn't mention anything about it. However the accuracy was so bad I find it hard to believe that a slight mismatch between magazine and barrel would account for the accuracy I saw. I'm talking like 6 inch scattershot groups at only 25 yards from a rest. Of course I could be wrong. Like the stock barrel, I tried .250 NSA slugs, and .2513s from AVS, .253s, and .254s with the tj barrel. I still have the tj barrel. Does Kelly sell the modded magazines and if not, where? If he does I find it strange he wouldn't mention them or put one on when i first got it with the tj barrel. Or when he sent me the stock barrel afterwards he made no mention of having to change the mag due to putting a different one on first