Never had a Hern's barrel, but I just got my GB "Thunder Cup" ( a 1/2 sized thunder mug, from my material) from Dom, very nice, he will work with you, and price is right! For sure, contact him! He does stamp them now with "Black Powder Only", and he is very quick ! I've also gotten two Mortars from Classic, excellent workmanship on barrels, also on sleds and beds. A disclaimer is for both parties protection, if they have one. Like they say, firing a cannon, mortar, or howitzer is nothing like any other gun! Know what your doing before you fire the first shot! BoomLover