The 1/2 x 20 UNF adaptor allows you to connect any standard 1/2 x 20 UNF moderator to your rifle shroud.

Fits to:

Brocock Compatto,

Benjamin Marauder Pistol (Prod)

Fits calibers: 177, 22 and 25. 

Comes with a thread protector and self-tightening tools (no other tools are required).

More information:

Diameter: 19mm

Thread's size: 11/16-24  (WHITWORTH G24)