I have one that was my fathers, with Purbaugh sub-gauge tubes. He never got the update done and from what I understand if it wasn’t done by a couple years ago, it’s too late as the parts are now vaporware. It’s a heavy gun especially with the 28 or 410 tubes in it, another thing (maybe for the update), has honest wear from being used. There are some issues with it from not having the update, if your interested PM me…not going to post here about them.