Strike Industries Modular AR Fixed Stock

Strike Industries Modular AR Fixed Stock

Product Code:
Calculated at Checkout
$35.95 $33.95



  • Customizable Length of Pull (12" to 14.25") with included shim set
  • Combines the versatility and adjustability of a collapsible stock with the strength, ergonomics, and solid fit of a fixed stock
  • Modular assembly
  • HK Hook attachment and sling loop
  • Install on carbine-length / A5 buffer tubes
  • Available in Black and Flat Dark Earth finish!
  • Compatible with Strike Industries MFS Extended Rubber Butt Pad and MFS Monopod (Optional)


  • Weight: 12.63 oz. (with mounting hardware and shim set)
  • Material:
    • Stock: Polymer
    • Mounting Hardware: Steel
  • Length:
    • Min: 9"
    • Max: 11.25"
  • Height: 5.13"
  • Width: 1.75"


  • Mil-Spec carbine-length and A5-length buffer tubes


  • 1x Modular Fixed Stock
  • 1x Stock Front Piece
  • 3x Adjustment Shims (0.75-inch)
  • 1x Carbine-Length / A5 Buffer Tube Adapter
  • 1x Adapter Screw


If you’re a fan of the personal defense or close quarters CQB stock and you need an AR-15 Fixed Stock, Strike Industries has heard your cries. The Modular Fixed Stock brings options for versatility and adjustability to the table along with the solid fitment, ergonomics, and hardiness of a fixed stock.

Fixed Stock, Custom Pull Length

The Strike Industries Fixed Stock accepts standard carbine length receiver extensions. When you need an AR fixed stock for an existing weapon, it’s no problem to fit an SI MFS. All you need to do is choose your desired length, install the correct spacing shims and you will have a custom length of pull and an AR-15 Fixed Stock that holds rock solid even under extreme operating conditions. As packaged the MFS is easy to customize in ¾-inch increments from 12 inches to 14.25 inches length of pull.

Polymer Construction with the Security of Steel

The Strike Industries Modular Fixed Stock features the light weight of a polymer AR Fixed stock with the security or quality steel mounting hardware. Strike delivers exactly what you need. Fit, feel, and reliability without compromise.

Field Ready Design

The field ready design of the Strike Industries Modular Fixed Stock requires no additional sling mounting hardware. It features an integrated HK hook Attachment and sling loop. Since you’re working with a solid stock you won’t have to quiet odd rattles when you’re on the move and there’s no worry about catching a latch and pulling up at the wrong length. Simply mount the SI MFS up at your desired length, clip on your favorite sling and you’re mobile, ready for whatever the next maneuver brings.


  1. Slide the front piece onto the carbine-length buffer tube until it touches the castle nut
  2. Install the buffer tube adapter on the first slot of the buffer tube
  3. Add adjustment shims if needed
  4. Install the Modular Fixed Stock onto the buffer tube
  5. Remove the rubber butt pad
  6. Use the adapter screw to secure the stock
Write a Review

8 Reviews

  • Great unit

    Posted by Quinton DeMarco-Bennett on 19th Jul 2021

    Great versatile stock with some upgrade options for a very competitive price.

  • Strike Industries Modular AR Fixed Stock and Extended Butt Pad

    Posted by Donald Howard on 28th Dec 2020

    First time ordering from Wing Tactical and I'm very pleased with the entire experience. I love my new Strike Industries Modular AR Fixed Stock. It was easy to install on my mil-spec carbine buffer tube. Fit of the spacers is very snug which is good. Stock is now set to my LOP and almost perfect. The stock also looks great! My only complaint is that the base of the optional extended butt pad is warped and leaves a gap at the top when you install the bottom screw. The screw is not over tightened. Tightening the screw to where it should be pulls on the bottom of the base and puts too much pressure on the small clip that secures the base to the top of the stock. I'm afraid the clip might snap at some time. I tried loosening the screw to relieve pressure on the clip but that leaves a gap in the bottom and the entire butt bad wiggles. This is no fault of Wing Tactical. May have been just a bad run by Strike Industries. I will leave the extended butt pad off and probably order another one. With the extended butt pad installed, my LOP would have beed perfect. The stock gets 5 stars though, and so does Wing Tactical! They shipped everything well packaged and delivery was right on time. Will definitely shop here again!

  • Very Pleased

    Posted by Ernest Atwood on 24th Nov 2020

    Great fixed stock at a great price. Used on an AR10, fits tight, easy install and still has adjustable length of pull. It’s a win in my opinion. Will always order from Wing Tactical first. Prices, shipping, customer service, and just a great company.

  • Solid fixed buttstock

    Posted by Mike on 20th Aug 2020

    I ;prefer fixed butt stocks, because they're solid and they don't grab your facial hair.

    This butt stock is extremely solid, and you even have to tap the extensions into place due to the tight fit. Very nice.

    I've got a 74" reach and for me to get nose-to-charging handle requires only two of the three spacers. So if I wanted to further back, I could be.

    I gave the stock 4 stars because, while I don't use them, there is no QD slot. Also, the attachment method is via steel and it could be made of aluminum saving maybe an ounce.

    In summary, I love the stock and wouldn't have any problem buying one again. It's a bargain, price wise, as well.

  • Viper modular fixed stock

    Posted by Richard on 18th Jan 2019

    This stock is great and doesnt break the bank. Loving how you u can adjust the lenght with spacers for your comfort. I compete in compitetions and living in cali were we cant have adjustable stocks anymore this stock benefits me having it to the lenght of my comfort when running the course.

  • Iooks great

    Posted by Paul e henderson on 10th Jan 2019

    Easy to mount on ar ,no buffer tube or spring to change on my carbine ,just slide it on tighten it up and your ready to shoot.very simple.

  • Great fit

    Posted by David on 7th Jan 2019

    Would buy another

  • Good fit

    Posted by Josh on 16th May 2018

    Good product good sis good price good But needs qd cup

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