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Folding Mechanism for AR Type Stocks (FSM-AR)-With Boss

Product Code: A504-K

Availability: In stock

Folding Mechanism for AR Type Stocks (FSM-AR)-With Boss

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Folding Mechanism with integrated AR15 type Stock interface. Now any AR type stock can be mounted on any receiver block that ACE makes. This includes collapsible and fixed length stocks. Only foldes to the left. The FSM-AR is manufactured with and without the Boss. The Boss is the raised (oblong shaped) portion on the Arm (small side). If you require one with or without the Boss pleases specify in the Order Instructions section during the checkout process. If you do not specify your order will be shipped based on availability.


  • This product WILL NOT work with standared AR-15 Rifles.
  • If you are ordering a receiver block with your folding stock mechanism we recommend you use an FSM with a boss.

Additional Information

Additional Information

Product Weight 4.5 oz
Material 7075-T6 Aluminum
Boss Option With Boss
Coating Anodized
Brand ACE by DoubleStar
Manufacturer DoubleStar Corp.
Country of Manufacture United States
Warranty Yes

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