Folding Stock Mechanisms

A500S-1.jpg
Steel FSM w/o Boss

The FSM-S is machined from 1018 CRS Steel, Case Hardened RC 62, and is finished with Ion-Bond Coating. It fits between the Receiver Block and Modular Stock. The FSM-S can be mounted to fold either left or right. Will add .55" to your LOP and weighs 5 oz.

The FSM-S is manufactured with and without the Boss. The Boss is the raised (oblong shaped) portion on the Arm (small side).

Image may differ from actual item. 

If you are ordering a receiver block with your folding stock mechanism we recommend you use an FSM with a boss.


$91.99 A500S Quantity:

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ACE - AR Stocks Folding Mechanism (FSM-AR) $89.99 A504 Quantity:

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A500PB-1.jpg
ACE - Push Button Folding Mechanism (FSM-PB) $94.99 A500PB Quantity:

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A500-1.jpg
ACE - Standard Folding Mechanism (FSM) $68.99 A500 Quantity:

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Folding Stock Mechanisms

Folding Stock Mechanisms

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