looking for what adapter fits the AA bull barrel with the twist. Purchased the maple leaf gspec barrel adapter that goes to 14mm neg but it doesn’t fit in the AA outer barrel. I’m looking for it to be brought to a 14mm neg male tip so I can use my silencers. Images show both the stock and cap that came with the bull barrel as well as the maple leaf adapter that goes to 14mm neg. THANK YOU FOR ANY HELP!!