Lower Receiver Assembly (AR-9, AR-15, and AR-10/LR108)
In this section, we will walk you through the lower receiver assembly process. We will cover this in a specific order to minimize having to undo/redo things.
Step L1: Pivot Pin Installation
In Step L1 of lower receiver assembly, we will install the pivot pin assembly onto the lower receiver.
Step L2: Magazine Catch Installation
In Step L2 of lower receiver assembly, we will install the magazine catch assembly onto the lower receiver.
Step L3: Bolt Catch Installation
In Step L3 of lower receiver assembly, we will install the bolt catch assembly onto the lower receiver.
Step L4: Trigger Installation
In Step L4a of lower receiver assembly, we will install the 2-piece trigger group into the lower receiver.
In Step L4b of lower receiver assembly, we will install the cassette style trigger group into the lower receiver.
Step L5: Safety Selector Installation
In Step L5 of lower receiver assembly, we will install the safety selector assembly into the lower receiver.
Step L6: Takedown Pin Installation
In Step L6 of lower receiver assembly, we will install the takedown pin onto the lower receiver.
Step L7: Receiver Extension Installation
In Step L7 of lower receiver assembly, we will install the receiver extension (including the castle nut and end plate, as applicable) onto the lower receiver.
Step L8: Pistol Grip Installation
In Step L8 of lower receiver assembly, we will install the pistol grip onto the lower receiver.
Step L9: Buttstock Installation
In Step L9 of lower receiver assembly, we will install the buttstock onto the receiver extension.
Step L10: Buffer Assembly Installation
In Step L10 of lower receiver assembly, we will install the buffer assembly into the receiver extension.
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