Purple Mountain Armory sells firearms, ammunition, and related products. You must be at least 18 years of age to enter.
Some products and transactions may require additional verification and a higher minimum age (21 for handguns under federal law).
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Prices and availability subject to change without notice. Product availability subject to applicable federal, state, and local laws.
This steel AR-15 castle nut is virtually indestructible and works with commercial, military, and hybrid buffer tubes. It fits most AR-15s and AR variants, but it is not compatible with 308 rifles.
