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Strike Industries SI-AR-15/M16 Receiver Extension Castle Nut
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Mars's Review of Strike Industries SI-AR-15/M16 Receiver Extension Castle Nut

It’s a dark grey color. Doesn’t match any buffer tube I have, including some from SI. Otherwise it’s a castle nut. Works, but if you expect a rich black color, look somewhere else. Threads are ok. Machining looks fine.
Pros:
  • works
Cons:
  • color
Would Recommend: No
Was it helpful to you? Yes | No
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Last updated 2025-11-12 UTC.