Upper Receiver Assembly (AR-9, AR-15, and AR-10/LR108)
In this section, we will walk you through the upper receiver assembly process. We will cover this in a specific order to minimize having to undo/redo things.
Step U1: Forward Assist Installation
In Step U1 of upper receiver assembly, we will install (or replace) the forward assist.
Step U2: Ejection Port Dust Cover Installation
In Step U2 of upper receiver assembly, we will install (or replace) the ejection port dust cover.
Step U3: Barrel Installation
In Step U3 of upper receiver assembly, we will install the barrel.
Step U4: Gas System Installation
In Step U4 of upper receiver assembly, we will install the gas system (gas tube and gas block).
Step U5: Muzzle Device Installation
In Step U5 of upper receiver assembly, we will install the muzzle device.
Step U6: Handguard Installation
In Step U6 of upper receiver assembly, we will install the handguard onto the upper receiver.
Step U7: BCG and Charging Handle Installation
In Step U7 of upper receiver assembly, we will install the bolt carrier group and charging handle.
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