Grey Birch MFG Precision Bolt Assembly For Ruger Polished Nitride Steel. The first was to tighten and control head space to .002 which significantly improves accuracy and consistency of accuracy. The second was to improve the external coating resulting in increased reliability and extended bolt life by resisting corrosion. And last but not least making assembly and disassembly easier. The Polished Nitride Finish Makes Cleaning Easy. Specifications for Grey Birch MFG Precision Bolt Assembly For Ruger 10/22: Manufacturer: Grey Birch MFG Condition: New Fabric/Material: Stainless Steel Finish: Polished Nitride Caliber: .22 Long Rifle Gun Model: Ruger 10/22 Takedown Gun Make: Ruger Package Contents: Grey Birch MFG Precision Bolt Assembly For Ruger 10/22 What firearm models does the manufacturer say Grey Birch MFG Precision Bolt Assembly For Ruger 10/22 is compatible with? The manufacturer suggests that Grey Birch MFG Precision Bolt Assembly For Ruger 10/22 is compatible with Ruger 10/22 TakedownGrey Birch MFG 1022Bolt: Precision Bolt Assembly For Ruger 10/22 Polished Nitride Steel