We did extensive tests one Satuarday years ago
@ Lea Valley Air Gun Club - Hertford
www.lvagc.com

Mostly through the contents of Supermicks then Car boot and collection of Gun's and varied Silencers

And found that the Little Sound Biter originally made for
.22 Rim Fire was one of the most effective Silencers
Especially for pistols @ 4 1/2 Long and being light as well
Yes it is a standard 1/2 UNF Female connector

Yes @ I still have Stock

BOB/R