Aero Precision AR15 Rifle Buffer 6 in. rifle buffer for A2 or A4 style AR15 rifles that have a fixed buttstock. Perfect for your new build or as a direct replacement for worn out parts. Note: Will not work with AR15 carbines that have a collapsible buttstock. . Specifications for Aero Precision AR15 Rifle Buffer: Manufacturer: Aero Precision Length: 6 in Condition: New Country of Origin: USA Package Contents: Aero Precision AR15 Rifle Buffer Aero Precision APRH100285C: AR15 Rifle Buffer 6 in