Strike Industries Enhanced Castle Nut and Extended QD End Plate

Strike Industries Enhanced Castle Nut and Extended QD End Plate

Product Code:
Calculated at Checkout
$56.95 $55.95



  • Centrally placed quick detachable (QD) socket for right or left hand sling use
  • Aesthetic upgrade
  • Easy drop in installation
  • Simplified installation of takedown pin detent via a set screw
  • Available in Black, Flat Dark Earth, Blue, Grey, and Red finish!


  • Material:
    • Enhanced Castle Nut: Steel
    • Extended QD End Plate: 6061-T6 aluminum
  • Finish: Hard anodized
  • Weight:
    • Enhanced Castle Nut: 0.95 oz.
    • Extended QD End Plate: 0.95 oz.


  • Carbine buffer tube

*First position on buffer tube will be lost due to the extended length of the Enhanced Castle Nut


  • 1x Strike Industries Enhanced Castle Nut
  • 1x Strike Industries Extended QD End Plate
  • 1x Set Screw
  • 1x Allen Wrench


Strike Industries Enhanced Castle Nut (ECN) and Extended End Plate (EEP) Kit



Strike Industries has made a name for itself addressing needs that are frequently overlooked by the rest of the firearms industry. With a reputation for attention to detail, you can bet that when Strike offers a parts kit, it’s something special. Strike Industries’ Enhanced Castle Nut and Extended End Plate kit is no exception. When you install these pieces on your rifle you’ll wonder why someone didn’t do it this way sooner.

When you order a Strike Industries Enhanced Castle Nut (ECN) and Extended End Plate (EEP) kit you’ll receive an Extended QD End Plate and an Enhanced Castle Nut and a set screw for simple installation of the takedown pin detent.

The Strike Industries EEP includes a Quick Detach Sling Swivel Mount in the center where it functions ambidextrously. The mount has been repositioned from the traditional placement, eliminating the risk of painful pinches to the webbing of the operator’s primary hand. You’ll handle your weapon more confidently, even in close quarters, because you don’t have to worry about painful accidents due to poor ergonomics.

Strike designed the ECN to better support the threaded part of your receiver’s extension and match the length of the Extended End Plate. The result is a better looking, more secure and functional ECN/EEP kit that you’ll be happy to have on your rifle whether you’re out on maneuvers or at the range.

Strike’s team of engineers and craftsmen has done it again with the Enhanced Castle Nut and Extended QD End Plate. They’ve made simple changes to small parts that others overlooked and improved the operator’s experience in the real world.

Note: Receiver Extension Tube (RET) may become damaged if EEP is installed on RET and then forced far enough rearward to allow full threading onto Billet or polymer lower receivers that have a RET support flange with a depth greater than 0.503."


Receiver Extension Tube support flange

Write a Review

20 Reviews

  • Buy it!!!

    Posted by Dan on 7th May 2020

    Wish I would have bought this with the rest of parts first. Aero precision castle nut that came with my buffer kit tube actually cracked after firing first so I got this to replace it and couldn’t be happier. Looks great and protects tube threads.

  • Strike industries castle nut and qd end plate

    Posted by Terry Bell on 1st Apr 2020

    Great look and fits well

  • Strike Industries Enhanced Castle Nut & Extended QD End plate

    Posted by Chris Merrill on 19th Jan 2020

    Strike Industries is my first choice and this end plate setup is very functional, easy to install and the color choices nice to have. It makes the AR really stick out.

  • Enhanced castle nut

    Posted by Richard Napierala on 8th Jul 2019

    Excellent fit, Quality product. Would recommend.

  • The enhanced castle nut looks killer and is very solid. Best looking castle nut and end plate on market I think

    Posted by eric heuring on 6th Feb 2019

    Quality products

  • Tim Arnold

    Posted by Tim Arnold on 13th Dec 2018

    Fit great. QD mount works with my sling mounts. Looks cool. The anodized color looks great with the FDE furniture.
    Yes; this part is anodized as the ad states. Not cerakote!

  • Strike ins. End plate/castle nut

    Posted by Scott on 9th Sep 2018

    These strike industries end plates and castle nuts are great, if your building a custom high end AR these are a must, I've yet to find a better part for that area of my rifle for that "tricked out" look.
    Better yet , for all those FDE rifles, wing tac is the only place you can get this in dark earth, by the way they shipped it immediately ..
    I only wish I could upload a picture of how awesome my ar is, these details make all the difference, the best things cost a little dough unfortunately, but you wont regret it

  • Looks good works great

    Posted by SethG on 24th Apr 2018

    Does exactly what you want, and looks great. Tight lockup and stays tight.

  • Great product but difficult to install with Quick Pins

    Posted by Walt on 18th Apr 2018

    Extremely well made as are all SI products and looks great on the gun. Only problem I had was that I installed it at the same time as I was installing a set of Cross Armory Quick Pins. There was not enough space for everything to rotate into place to secure the buffer retainer pin so I had to do a lot of filing of the end plate tab to get it to fit. If I wasn't installing the Quick Pins, it would have installed very easily.

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