Strike Industries Multi-Function End Plate and Anti-Rotation Castle Nut

Strike Industries Multi-Function End Plate and Anti-Rotation Castle Nut

Product Code:
Calculated at Checkout
$32.95 $29.95



  • Set screw to retain takedown pin and detent for ease of installation
  • No peening or staking needed with the Anti-Rotation Castle Nut/End Plate design
  • Anti-rotate QD socket
  • Multiple sling attachment points


  • Material: Steel
  • Finish: Black
  • Weight:
    • Multi-Function Endplate: 0.71 oz.
    • Anti-Rotation Castle Nut: 0.63 oz.


  • AR-15 and AR-10


  • 1x Multi-Function Endplate
  • 1x Anti-Rotation Castle Nut
  • 1x Detent Set Screw
  • 1x Anti-Rotation Set Screw





How many times have you heard this: “Well, that’s the way we’ve always done it.”? It doesn’t matter where it is, that’s dangerous talk. When you’re talking about a subject as dynamic and progressive as tactical firearms, it’s downright restrictive, antique thinking. Something as seemingly simple as the traditional installation and peening of the AR 15 castle nut bogs down progress. In order to free the armorer who wants to rebuild rifles, or swap out parts as better choices come to market, Strike Industries has developed the SI Anti-Rotation Castle Nut (ACN) and Multi-Function End Plate (MFEP.)

A Simple Idea Opens Doors for You

Strike Industries was built on supplying the small arms community with superior versions of products that other manufacturers don’t bother with. Their Anti-Rotation AR 15 Castle Nut and Multi-Function AR End Plate Set features a detent set screw and anti-rotation set screw to secure your system rather than using the old way of securing the receiver extension by peening or staking. The result is added flexibility you might never have thought about before but will enjoy when it comes time to replace worn parts or try something new. You’ll no longer hesitate to do something just because it’s a pain in the neck to disassemble.

Be Flexible, Stay Ahead

You want every edge you can get. Now, you can easily stay an extra step ahead with the freedom and flexibility brought to you by the Strike Industries Anti-Rotation Castle Nut and Multi-Function End Plate.
The Multi-Function AR End Plate (MFEP) allows you to choose your preferred sling type. Whether you use a hook and loop, traditional sling loop or you need a quick detach socket, they’re all here. You’re not married to one or another and you can change as often as you like without changing the end plate. Add this to the easy removal of the Anti-Rotation Castle Nut and your AR system is now an ultra-flexible weapon system that you can retool for whatever the future holds. Stay ahead of the competition, and Strike First.

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11 Reviews

  • Strike Ind multifunction end plate

    Posted by Peter Ljubicich on 10th Aug 2020

    I like it. It doesn't take up excessive space and doesn't force me to over tighten the castle nut.. no one wants a loose buffer tube.

  • Must buy

    Posted by Ace on 12th May 2020

    If you like options and quality stuff, buy anything from Strike Industries. This thing is amazing.

  • Amazing End Plate

    Posted by Matthew on 21st Jul 2019

    This plate and castle nut are nearly perfect. Nice matte color, and very durable finish.

    One of the minor issues I have is how sharp the edges are, not like they'll cut you but they will tear up some softer metal clips real quick. Also the side I have facing out had a rust spot that was covered poorly with a sharpie I assume, it rubbed off with isopropyl not real happy about that but not the end of the world.

    Overall this thing is amazing and will buy one for all future rifles. First time using wingtactical and they were great, shipped and received super quick, great pricing, will be buying from again.

  • Very nice

    Posted by Richard F on 5th Jun 2019

    This thing looks great, is easy to install, and NO staking. Yes, the little spring retainer screw is challenging to put in. But not worth a star subtraction. Obviously lock-tight those little screws!

  • Great product

    Posted by Unknown on 24th Mar 2018

    Another great product from Strike Industries. nice that you don't have to stake anything definitely happy with my purchase here.

  • Cheap metal

    Posted by Grunt on 29th Jan 2018

    I purchased this because i liked all the sling mounting options. After I properly torqued it down the castle nut it just snapped in half. The metal feels cheap and of poor quality also the small screws are a pain. Go with the PWS Ratchet Lock system as it's much stronger and easier to mount. *This is garbage.

  • Awesome and a better castle but it there

    Posted by Daren Dowsett on 10th Jan 2018

    This is my second one I bought and just freaking love this, will diff. Buy again and the price was spot on. Thanks again wing tactiacl

  • Works great!

    Posted by Madclown351 on 2nd Jan 2018

    Someone complained about having to remove material to get this to fit I’m not sure why but on my phase 5 tube attached to a seekin lower and Spike jack lower they work great!

  • Innovative design

    Posted by Mark on 3rd Nov 2017

    Very Innovative design. Works great.

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