Strike Industries Modular Fixed Stock




Strike Industries Modular Fixed Stock BLACK Customizable Adjustable Shims

Strike Industries Modular Fixed Stock Meets California Featureless Stock Law Rousch Sports


The Strike Industries Modular Fixed Stock combines the versatility and adjustability of a collapsible stock with the strength, ergonomics, and solid fit of a fixed stock.

The SI MFS uses a standard carbine length receiver extension and is adjusted using the included shim set to change length of pull.

If your rifle came with an OEM Mil-Spec Carbine Buffer tube and you want to Install the Modular fixed stock to become compliant with California or other states that require a featureless Fixed Stock (Rather than a collapsible stock) this is the perfect match.

If you are just looking for the look or feel of a fixed stock the SI MFS makes it happen at an extremely economical price for the practical  AR Enthusiast.



  • Customizable Length of Pull (12″ to 14.25″)
  • Modular assembly
  • HK/Snap Hook attachment and sling loop
  • Fitment: For mil-spec carbine or the Strike Industries Advanced Receiver Extension 7-Position buffer tubes only. AR-15/AR-308

Product Specifications:

  • Weight: 12.8 oz
  • Materials: Polymer with steel mounting hardware
  • Color: Black
  • Meets California Featureless AR Parts & Accessories Laws 



  • One:  Modular Fixed Stock
  • Three Adjustment Shims (0.75″)


Strike Industries Optional Accessories (sold Separately) for the MFS include:

  • Strike Industries MFS Extended Rubber Butt pad
  • Strike Industries MFS Monopod


Questions & Answers

Q: Will this fit on an A2 buffer tube for an AR-10?

A: No, it is for mil-spec carbine buffer tubes.


Q:This looks like it will fit on an A2 buffer tube or is this for carbine length tube only?

A: No, it is for mil-spec carbine buffer tubes.



Due to numerous factors that take place during the coloring process, the color lines from batch to batch of a certain product may vary slightly

As is standard in all Industries we cannot guarantee color match with other manufactures items

All items should be installed by Experience Licensed Armors.

Other pieces me be needed to Install this item.

If you are unaware of what items are need to install please consult a licensed installer.

Additional information

SI Modular Fixed Stock

Modular Fixed Stock – Black, Modular Fixed Stock – FDE, MFS Extended Rubber Butt pad – Optional, MFS Monopod – Optional