No modification to firearm required.
Fits all Ruger Precision Rifles 5.56/.223/.308 using any mspec trigger group with common .154 diameter holes.
Included * 2 (two set)
Two: Custom designed Anti Rotation End Retainers
Two: .154 Diameter Pins
Four: Screws to secure End retainer to Pins
One: torx wrench to secure the Four screws to the Pins