AR-9 BCG Adapter Weight


  • Manufacturer: MW Precision
  • Model: AR-9 BCG Adapter Weight
  • Caliber: 9mm
  • Weight: 2.7 oz
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In stock


  • Manufacturer: MW Precision
  • Model: AR-9 BCG Adapter Weight
  • Caliber: 9mm
  • Weight: 2.7 oz

AR-9 BCG Adapter Weight

  • US Made 304 Stainless Steel
  • Allows AR-9 BCG to be used with JP SCS 9mm Recoil System


  1. Ensure Firearm is unloaded and remove AR-9 BCG
  2. Locate ¼” Roll Pin which secures stock weight to rear of AR-9 BCG
  3. Drive the roll pin out using a ¼ punch (roll pin punch preferred)
  4. Remove stock weight from AR-9 BCG.
  5. Insert MW Precision weight into rear of AR-9 BCG
  6. Reinstall AR-9 BCG/MW Precision weight into Upper Receiver
  7. Install JP SCS 9mm recoil system per manufacturers’ instructions.  (NOTE: The Buffer Retainer Pin and Spring must be removed from the lower prior to use of this upgrade.)

**Please note:  Because of variations in finishing, slight hand fitting may be required.



The MW Precision AR-9 9mm Bolt Carrier Group Adapter Weight is proudly MADE IN THE USA by hard-working American men and women.

Additional information

Weight.15 lbs
Dimensions2.5 × 1.5 × .75 in


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Questions and answers of the customers

  1. 0 votes
    Answered by the admin

    Copied from the JPRifles website:

    "9mm Bolts With Masses Removed
    The central mass slug of some manufacturers’ 9mm bolts must be
    removed to allow the Silent Captured Spring to function properly.
    This represents a reduction in the overall mass of the operating
    system. While the standard 9mm SCS can off set much of this loss,
    the Enhanced Version offers a wider range of mass adjustment to
    ensure reliable function."

  2. 0 votes

    This is not 100% compatible with Law Tactical adapter, modifications would be required to the weight and the Law Tactical bcg adapter.  For the silent capture spring, you just drive out the 1/4" roll pin holding the existing weight out, and slide the adapter in.  The buffer detent MUST be removed prior to use; otherwise, it will get broken off.

  3. 0 votes


  4. 0 votes

    Per Armaspec, they don’t know if it will work with the SRS, but state that it will work with the SMB.

    Inside diameter is .53".

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