4andy10, I only mention the BT-99 because of the post the other gent placed here. I need the choke for an auto-5 that was choked at briley when the 25ml system was the choice. If you have a choke that is marked series 25 ml Briley has told me it will work without question so I am searching for an improved Cyl or light mod.
Let me look for the discription I sent to Briley a long while back. Here it is... 0.787” = threaded od. 0.773” = non-threaded breach end of tube od. 0.737” id breach end. 0.707” id bore. 2.10” threaded length. O.650” non-threaded length. 2.750” overall length. Around 25 tpi.
This was for a choke that was only marked with "MOD"