Upgrade your AR15 with the Guntec AR15 Heavy Duty Castle Nut. Designed for enhanced durability, this extra-wide castle nut provides a stronger, more secure hold for your rifle. Crafted from robust steel with a nitride finish, it fits both Mil-Spec and commercial buffer tubes. Proudly made in the USA, this castle nut is an essential addition to your AR-15 accessory collection.
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