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Questions & Answers
Will this work along with the law tactical folding adapter? Expert Answer

Yes. The Strike Industries Ultralight Multi-Function End Plate will fit and function as intended with or without the use of a LAW Tactical Folder.

by Ethan, Gear Expert, August 3, 2022
will this work with the Strike Industries PDW 2-Position Stabilizer Brace? Manufacturer Answer

Our PDW will not be compatible with the UL MFEP&ACN.

by Strike Industries, Manufacturer, May 11, 2022
Customer Reviews
Most Recent Reviews Fitment information would be nice. by Rambo, Verified Owner, July 17, 2025
This and one other part cannot be used. This will not work with a MagPul rifle stock/rifle buffer tube.
Most Recent Reviews Very simple install by Brandon Noe, Verified Owner, May 13, 2025
I always find the concept of changing my castle nut very intimidating, because i feel like I'd mess it up. But with this version, it was very simple and straight forward. So far ive put my gun through 400 rounds since the replacement, and it hasnt go...
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Most Recent Reviews Works for most by GalilDan, January 17, 2024
The product does what it describes. Two negative points for me. One I put it on an SA quick detach stock adapter which wouldn't fit due to the QD point being on both sides. I had to modify it by filing off one side. Not a big deal but a point non the...
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0/1 found this helpful
Most Recent Reviews Nice, but...... by Alittlepeeved, Verified Owner, March 20, 2025
I had to file away the edges of the anti-rotation tab to make it fit on a mil spec tube.
Most Recent Reviews Easy install by Alfonso Gomez, Verified Owner, September 26, 2024
This was a breeze to install! Hoping that it lasts a while. So far it has served its purpose!
Most Recent Reviews pretty seek end plate and castle nut by Cody Andrus, Verified Owner, April 27, 2024
I like it. Finish is good. Fot is good. And shipping was super fast for this order
Read All 9 Reviews
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Product Info for Strike Industries Ultralight Multi-Function End Plate w/ Anti-Rotation Castle Nut

The Strike Industries Ultralight Multi-Function End Plate and Anti-Rotation Castle Nut are designed to update and upgrade the often neglected castle nut and endplate system. Now available in an ultralight 7075-T6 aluminum version that is anodized in color options to customize the look of your AR. While the traditional endplate and castle nut works extremely well in retaining your receiver extension, the peening of the castle nut is not conducive to rebuilding or upgrading. With the vast amount of aftermarket support for the AR system today, SI feels that theres a need for a secure system as adaptive as you are. Enter the MFEP and ACN. The SI MFEP and ACN offers a built-in anti-rotation QD socket and sling loops. The MFEP is reversible to orientate sling loops to desired side. The Anti-Rotation Castle Nut (ACN) is specifically designed to work with the Multi-Function End Plate (MFEP). Instead of peening the endplate to secure the castle nut, a set screw fulfills this function to allow for multiple uses as you upgrade or update your build. Also never worry about finding a flying takedown pin detent and spring again as there is an included set screw on the MFEP for ease of installation or removal. Consider the Strike Industries Ultralight Multi-Function End Plate and Black Anti-Rotation Castle Nut for your next build or upgrade for both functionality and form of your AR-15 and/or AR-10.image

WARNING: California`s Proposition 65

Specifications for Strike Industries Ultralight Multi-Function End Plate w/ Anti-Rotation Castle Nut:

Manufacturer: Strike Industries
Fabric/Material: Ultralight 7075-T6 Aluminum
Gun Make: AR Platform
Gun Model: AR-10, AR-15
Weight: 1 oz
Condition: New

Features of Strike Industries Ultralight Multi-Function End Plate w/ Anti-Rotation Castle Nut

  • End plate set screw to retain takedown pin detent and spring for ease of installation or removal
  • MultiFunction End Plate is reversible to orientate sling loops to desired side
  • No peening or staking needed with the AntiRotation Castle Nut and MultiFunction End Plate design
  • Antirotation QD socket
  • Multiple sling loop attachment points
  • Ultralight anodized 7075T6 aluminum construction

Package Contents:

  • Strike Industries Ultralight Multi-Function End Plate w/ Anti-Rotation Castle Nut
  • x1 Multifunction end plate
  • x1 Antirotation castle nut
  • x1 Set screw for antirotation
  • x1 Set screw for detent and spring
  • x1 Loctite Threadlocker Blue 242
  • x1 Warning card

Strike Industries Ultralight Multi-Function End Plate w/ Anti-Rotation Castle Nut Orderable Models

List of Orderable Models

Strike Industries Ultralight Multi-Function End Plate w/ Anti-Rotation Castle Nut, FDE, One Size, SI-AR-UL-MFEP&ACN-FDE , MPN: SI-AR-UL-MFEP&ACN-FDE , UPC: 793811764482 , Code: 3Q-REP-ULMFEP-SI-AR-UL-MFEP-ACN-FDE
Strike Industries Ultralight Multi-Function End Plate w/ Anti-Rotation Castle Nut, Red, One Size, SI-AR-UL-MFEP&ACN-RED , MPN: SI-AR-UL-MFEP&ACN-RED , UPC: 793811764499 , Code: 3Q-REP-ULMFEP-SI-AR-UL-MFEP-ACN-RED
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