Is it a Venom?

[gtfreight]

A 1965 HW35. So you would need to take it apart and have a look at the piston as it might be an O ring conversion but depends at what point the previous owner had it tuned. I haven't a record of serial numbers and guns tuned but full custom rifles serial numbers will give an indication of the period tuned
Venom Industries, Venom Arms, Venomac, Webley Venom.
Mach 1.5

It had the original leather piston seal with it and the tp was at 4mm. I sleeved it down to 2.8mm and put a modern piston it it (still got the original) . What I was later told was a giveaway was that the trigger block had a steel guide threaded into it but I had already removed it and replaced it with a delrin one.