https://midstatefirearms.com/product/a2-rifle-stock-buffer-tube-kit-for-ar15-m16/

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Solid fixed A2 stock rifle kit for your Ar15 rifle build.  Fits mil spec standard 5.56 lower.
  • Snag free design to prevent any tangles with gear
  • Rear trap door for storage
  • Single Sling Point
  • Rubber textured butt-pad
  • Mil-Spec A2 Buffer Extension Tube
  • Mil-Spec Recoil Spring
  • Buffer Assembly
  • Stock Spacer & Screw