Dont think it is threaded on. Pretty sure its pressed on and pinned.
Pressed on and pinned ... generally NOT serviceable to swap a barrel within the block. When HW replacements are sold, done so as an assembly barrel/block. CW Chambers in the UK is the 1st place to look. ( HW80 ) is the base model that sells here as the Beeman R1
Quote from: SYNCRO76 on March 17, 2019, 06:09:34 AM Dont think it is threaded on. Pretty sure its pressed on and pinned. The old one you removed was a press fit ? , on my newer HW's there is that strange looking nut on the breech end.