Strike Industries AR Enhanced Castle Nut & Extended QD End Plate, Black - SI-AR-ECN&EEP-BK

Strike Industries AR Enhanced Castle Nut & Extended QD End Plate, Black - SI-AR-ECN&EEP-BK - Castle Nut - view 1
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Strike Industries

Overview

The Strike Industries AR Enhanced Castle Nut & Extended QD End Plate is designed to secure your buffer tube while offering a Quick Detach (QD) point for slings. The castle nut ensures a reliable attachment, while the extended end plate adds versatility for mounting accessories. This setup is commonly found in builds featuring a mid-length gas system chambered in 5.56 NATO, providing a well-balanced performance for a variety of applications.

Specifications

MPNSI-AR-ECN&EEP-BK
TypeQD
ColorBlack

Available Merchants(3)

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KY Gun Company
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$58
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Palmetto State Armory
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Brownells
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Builds Featuring This Part

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Builds in the community that include the Strike Industries AR Enhanced Castle Nut & Extended QD End Plate, Black - SI-AR-ECN&EEP-BK

BuildPartsTotal
16.5" recce
25$1859.28
Aero Precision 14.5" build
17$1420.18
20" noveske clone
25$2467.55
for steel matches 10.5"
27$3333.13
8.5" ke arms clone
29$3832.38
aero precision 14.5" 5.56
25$2041.13
My build
23$1868.60
latest build
30$3865.30
Carbine 16" 5.56
29$3625.33
aero precision 16" build
29$1924.78
wilson combat 16" 5.56
22$1511.24
my .223 wylde build
16$803.25

Customer reviews

4.5out of 5

2 global ratings

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Top reviews

R
RelentlessRobx
Good combo install fiddly
Reviewed on May 8, 2026Verified with Build

The end plate has integrated QD which is exactly what I wanted but the castle nut wrench notches are a little undersized. My standard AR wrench fit but barely. Once it was torqued and staked it locked everything down tight. Wouldnt say beginner friendly.

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xsimplejack627
Castle nut and QD end plate set
Reviewed on February 15, 2026Verified with Build

Strikes enhanced set has the bigger wrench notches than a milspec castle nut which makes torque easier. The end plate has an extended QD point that sits behind the receiver, easy to reach for a sling. Anti rotate flange seats correctly into the lower receiver.

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