52 ER5333
In Stock!

Fast and Accurate Order Processing

We offer standard, 3 day express, 2 day express, and overnight express shipping options for your convenience. If you place your order Monday - Friday by 2:00 PM EST using one of our express shipping options, your order will be processed and shipped the same day it is placed!

Applies to delivery within the 48 contiguous states only.

  • Fits: AR-15 and all AR variants
  • Made from steel and coated black
  • Standard military specification
  • Compatible with shotgun adapter

Ergo, the premier manufacturer of firearm accessories, manufactures all of its accessories in the USA with the highest standards and tightest tolerances. This military spec. Castle Nut works with commercial, military and hybrid buffer tubes.

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