While visiting Sergey Levkov at Lapco a while back I got a box of parts which included this custom barrel he machined, likely prior to 1995.
Sergey has always manufactured paintball and non paintball items as Technical Trouble Shooting, and during the early 1990s he was making runs of parts while also customizing markers. I believe he had a run of parts (barrels and other pieces) done in this high polish silver gloss finish, since I also saw a custom cocker thread barrel that matched.
This barrel would fit a Line SI or Montneel breech with a slip fit clamp down screw.
Today Sergey runs Lapco Paintball at https://lapcopaintball.com and during his time in paintball he has produced parts for countless companies.
A while back we posted a video on Sergey’s involvement with Doc’s Fastback cocker and hopefully we’ll create more videos with Sergey eventually. And here is a great article from a couple months back documenting many of Sergey’s early custom VMs and other designs.