Strike Industries Multi-Function End Plate & Castle Nut, FDE

The Strike Industries Multi-Function End Plate (MFEP) and Anti-Rotation Castle Nut (ACN) update the receiver extension retention system for AR platforms. Designed for Mil-Spec AR-15 and AR-10 ArmaLite/DPMS pattern upper receivers, the MFEP provides three integral sling mounting options and a reversible orientation. The ACN uses a set screw rather than peening to secure the castle nut, allowing for easier disassembly and repeatable reconfiguration. The assembly features an anti-rotate QD socket and is finished in Flat Dark Earth on ultralight anodized 7075-T6 aluminum.

Key Specifications

• Made from 7075-T6 anodized aluminum for strength with minimal weight.
• Finish is Flat Dark Earth (FDE) for a subdued appearance.
• Includes 1 Multi-function end plate, 1 Anti-rotation castle nut, 1 set screw for anti-rotation, 1 set screw for detent and spring, and Loctite Threadlocker Blue 242.
• Provides an anti-rotate QD socket plus multiple sling attachment points including a traditional loop and a hook-style loop.
• The end plate is reversible to orient sling loops to the desired side.
• No peening or staking is required thanks to the set screw retention system used with the anti-rotation castle nut.
• Compatible with Mil-Spec AR-15 and AR-10 ArmaLite/DPMS pattern upper receivers.
• Includes an end plate set screw to retain the takedown pin detent and spring for easier installation or removal.
• Designed to be ultralight to minimize added weight to the receiver extension.

Whether you are assembling a lightweight, modular AR platform or refining sling attachment options on a daily-carry build, this end plate and castle nut combination offers durable, serviceable features that simplify maintenance and enhance flexibility. The reversible design, QD socket and included installation hardware deliver a repeatable, user-friendly upgrade that supports a wide range of accessory preferences.