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Strike Industries Multi-Function End Plate and Anti-Rotation Castle Nut for AR15 / M4 Rifles (Color: Flat Dark Earth)

ID: 30004 (Parts-SI-AR-UL-MFEP&ACN-FDE)
Strike Industries Multi-Function End Plate and Anti-Rotation Castle Nut for AR15 / M4 Rifles (Color: Flat Dark Earth)
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Strike Industries


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Non-Export ItemShips Inside USA Only
This is an export-restricted item and can only be shipped within the United States. No international delivery for these items.


  • End plate set screw to retain takedown pin detent and spring for ease of installation or removal
  • Multi-Function End Plate is reversible to orientate sling loops to desired side
  • No peening or staking needed with the Anti-Rotation Castle Nut and Multi-Function End Plate design
  • Anti-rotation QD socket
  • Multiple sling loop attachment points
  • Ultralight anodized 7075-T6 aluminum construction
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 there™s 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.

Manufacturer: Strike Industries


Compatibility: Mil-Spec AR-15 and AR-10 ArmaLite/DPMS pattern upper receivers
Torque: Do not exceed 35 ft/lbs (47.45 nM) for the castle nut
Material: Steel
Package Includes: 1x Multi-function end plate, 1x Anti-rotation castle nut, 1x Set screw for anti-rotation, 1x Set screw for detent and spring, 1x Loctite® Threadlocker Blue 242®, 1x Warning card

-Anodized areas that touch between end plate and castle nut will have expected minor scratches from torqueing of castle nut
-Due to numerous factors that take place during the anodization process, the color lines from batch to batch of a certain product may vary

-Before every use, always check proper function of your QD mount and/or sling loop and any wear and tear from use
-Always have your weapon in the SAFE position when not being fired
-Always follow all firearms safety rules and never point your weapon at anything you are not willing to destroy

About Strike Industries

Strike Industries, always innovating and providing the best quality firearms accessories at the best prices since 2010.

2 Customer Reviews

(Write a review)

by Whit M. on 09/02/2020
"Fits my VFC 416D GBBR just fine. Great solution for attaching a sling plate.
by Steven T. on 07/31/2021
"The product itself is solid:
Made from steel, no burrs, cut to spec, choice of QD, Hook, or Wrap attachment, ambidextrous, and priced reasonability

This product is meant for real steel and you might run into compatibility issues (TM spec buffer tubes would likely not have an issue, but Ares spec buffer tubes has a high chance or a problem). I have an EMG Daniel Defense and EMG SAI GRY M4 platform (both G&P OEM guns) and I needed to 3D print spacers such that I could use this product correctly (without the spacer, the buffer tube was clipping the battery wires). You could dremel your old endplate into a spacer if you have the right tools – but that’s extra work some folks may not be comfortable with doing.

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