FRS-15 .308 stock adapter Black Rain/Windham Profile

Availability: In stock

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Regular Price $30.99 Now Only $24.79

The FRS-15 Rifle Stock, as designed, fits at the pistol grip attachment point of any AR-10 (.308) rifle, however the rear of the lower receiver where the buffer tube attaches is about 3/8" longer to accommodate the longer bolt carrier group. The area utilized by the extra length takes up a critical space that the shooters hand needs to hold the rifle and absorb recoil comfortably.

Our adapter kits are designed to relieve this area giving the shooter maximum comfort and control of the rifle. It achieves this by moving the grip down .37" and .15" to the rear of the standard grip attachment point.

The adapter is 3D machined in two halves from billet ABS thermoplastic that are hand assembled, chemically bonded, cured in a 12 ton hydraulic press, and hand finished.


  • Black Rain Ordinance (all .308 models)
  • Windham Weaponry (all .308 models)

Other makes / models may be compatible, call our technical support team at 650-588-3700 for assistance.


  • BRO / Windham (.308) Adapter
  • Shortened safety detent spring
  • 1/4-28x1¼" mounting screw
  • Installation instructions

Made in USA

This product is intended for lawful purposes only. It is the responsibility of manufacturers, dealers, and end users to fully understand and adhere to Federal, State, and local laws when using this product. Thordsen Customs LLC and its industry partners will not be held liable for any unlawful configuration or other misuse of its products.

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