Custom AR9 Bolt Extension .531 for ARH300

Custom AR9 Bolt Extension .531 for ARH300


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

SKU: RBE-531

This is a replacement bolt extension for our Gen. 3 Folding Stock Adapters that have a smaller diameter bolt extension at .531 to fit FX9 and other AR9 builds that have a smaller bolt carrier group. To ensure proper fitment please measure the opening to your BCG. Not all AR9’s require a smaller bolt extension and can work with the standard .625.

If you have any questions please contact us before ordering.


Additional information

Weight.5 lbs


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