Please notice that the Ruger Shoulder Stock is only suitable for small calibers such as .22, .22 Magnum, .22 Hornet
Suitable for all .22 pistols having Picatinny-rails
No tools needed for mounting
The length of the shoulder rest is adjustable.
There is a screw that you can tighten by hand or with 4mm allen head key
For Ruger mark II/III, Browning Buck mark, Thompson Center, etc.