Custom AR9 Bolt Extension .531

Custom AR9 Bolt Extension .531


Please contact an authorized representative to order through email at or by phone at 888-256-5632

SKU: RBE-531
Categories: ,

The Custom AR-9 Bolt Extension is for our Folding Stock Adapter customers that have a smaller diameter BCG. The Bolt Extension diameter is .531, commonly used to fit FX9 and other AR9 builds that have a smaller diameter bolt carrier group. To ensure proper fitment, please measure the inside diameter of your BCG. Not all AR9’s require a smaller bolt extension and can work with the standard .625 bolt extension that comes with our Folding Stock Adapter.

Product Details

  • Weight: 2.925 oz.
  • Diameter: .531 in.
  • Most commonly needed for FX-9’s

If you have any questions, please contact us before ordering.



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