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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.
Strike Industries AR Enhanced Castle Nut & Extended QD End Plate, Black - SI-AR-ECN&EEP-BK
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Builders on GunPartPicker first added the Strike Industries AR Enhanced Castle Nut & Extended QD End Plate, Black - SI-AR-ECN&EEP-BK to a build in February 2026.
It was hard to find in August 2026, in stock on only 2 of the 7 days we checked, and today 3 of the 4 retailers we track have it in stock. Prices barely moved in August 2026, holding around $57.95, so there haven't been real sales lately. Buying today, the lowest price is $57.95 at Brownells, which matches the best price we saw in August.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
Builds in the community that include the Strike Industries AR Enhanced Castle Nut & Extended QD End Plate, Black - SI-AR-ECN&EEP-BK
| Build | Parts | Total |
|---|---|---|
 | 25 | $1781.34 |
 | 17 | $1475.79 |
 | 25 | $2575.39 |
 | 27 | $3383.35 |
 | 29 | $3774.21 |
 | 25 | $2112.13 |
 | 23 | $1734.70 |
 | 30 | $4042.75 |
| 29 | $3802.78 |
 | 29 | $2042.37 |
 | 22 | $1630.07 |
 | 16 | $1128.93 |
2 global ratings
Top reviews
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.
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.
