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Strike Industries
Overview
The Strike Industries End Plate and Anti-Rotate Castle Nut is a standard steel component designed to secure the buffer tube to the receiver while preventing any rotational movement. This combination provides a reliable foundation for your AR-15 build, ensuring that the buffer tube remains aligned during operation. You will often find this end plate and castle nut set used in mid-length gas system builds chambered in 5.56 NATO, where durability and stability are essential.
Strike Industries End Plate and Anti-Rotate Castle Nut for Receivers, Red - SI-AR-UL-MFEP&ACN-RED
Prices checked
Strike Industries End Plate and Anti-Rotate Castle Nut for Receivers, Red - SI-AR-UL-MFEP&ACN-RED is the second most added end plate on GunPartPicker so far in October 2026, behind the Radian Weapons Ultralight AR15 QD Endplate Black, with about 21% of all end plates added to builds. Up from #3 in August and September. Builds with this end plate are mostly chambered in 5.56 NATO (71%, then .223 Wylde 8%), mostly on mid-length gas (60%, then carbine-length 19%), and mostly AR-15 (93%).
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today 4 of the 6 retailers we track have it in stock. Prices barely moved in September 2026, holding around $35.95, so there haven't been real sales lately. Buying today, the lowest price is $35.95 at Palmetto State Armory, which matches the best price we saw in September.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
We ranked every end plate by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 End Plate Guide →The part most often added in each category by hundreds of builds that include this one
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Aggregated and anonymized data showing how builders use this product
Builds in the community that include the Strike Industries End Plate and Anti-Rotate Castle Nut for Receivers, Red - SI-AR-UL-MFEP&ACN-RED
| Build | Parts | Total |
|---|---|---|
| meta? | 24 | $2358.67 |
| Ar-15 | 21 | $2296.41 |
 | 23 | $2881.67 |
 | 30 | $5282.66 |
 | 27 | $2191.34 |
 | 28 | $2670.97 |
 | 37 | $6703.25 |
 | 22 | $3045.81 |
 | 19 | $674.71 |
 | 25 | $1885.57 |
| 22 | $2135.44 |
 | 34 | $4833.73 |
1 global rating
Top reviews
This Strike Industries end plate and castle nut feels sturdy enough. The red color is a nice touch for my build, though it was slightly darker than I expected from the photos online. Overall, it holds the buffer tube securely.
