I ain't seen the Pietta piece, but, since you mentioned wedge system, I'm assuming it's a Colt '51, 61 or variant thereof. I've got both '51s and '61s and love 'em. Wedge that holds the bbl in place is not a problem. I don't have any Piettas tho. But, in my Armi San Marcos or Ubertis, a rubber mallet or wood mallet knocks it right out. making disassembly a breeze. I've never had a wedge come out that was installed correctly.