DoubleStar Corp FSM-S Steel Folding Mechanism with Boss

Manufactured by DoubleStar Corporation
SKU: A500S-K
MPN: A500S-K
Manufactured by DoubleStar Corporation
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NOTE: Limit 5 per household. Quantities exceeding 5 will not allow checkout.

We are fully staffed and processing orders. Standard orders are shipping in approximately 1 business days or less. FFL orders take approximately 10 business days or less if you can provide us an actively receiving FFL location. Due to high demand, there is a limit of 5 FFL items in a 30 day period.



The DoubleStar Steel Folding Stock Mechanism (FSM) with Boss attaches between the receiver block and stock on your AK platform rifle and allows you to fold your stock to either the left or right side. The A500S-K is designed for use with AK style stocks and will add .55” to your LOP. The “Boss” is the raised portion on the arm and adds rigidity to the system.

Note: Requires the corresponding receiver block. (The non-boss model does not require a receiver block).

  • Folding stock adapter for AK pattern stocks
  • Includes boss for increased rigidity
  • Machined from 1018 CRS Steel
  • Black Nitride coating
  • Can be mounted for left or right folding
  • .55” increased LOP
  • Weight: 5 oz.

The DoubleStar Corporation started out as a retailer selling AR-15 parts and Accessories. Soon they began designing and manufacturing their own parts and accessories and eventually moved on to full weapon systems. Located in Kentucky, DoubleStar is dedicated to building rifles with US made parts only, so you know that what you receive is high quality.
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BrandDoubleStar Corporation
TypeStock Adapter

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