A barrel nut is a threaded component used to secure the barrel to the upper receiver on AR-15, AR-10, and similar rifles. It also provides a mounting point for the handguard. The barrel nut works with AR-15/AR-10 upper receivers, barrels, hand guards (free float or drop-in), delta ring assemblies, and sometimes gas tubes and barrel wrenches. It’s essential for proper barrel installation, ensuring a secure fit and alignment in custom builds, upgrades, or repairs of AR-platform rifles.
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