Learn how to assemble an AR-15 lower from a complete parts kit in this step-by-step, beginner-friendly guide. I walk through each component and tool you’ll need, demonstrate proper installation of the fire control group, buffer assembly, pistol grip, trigger guard, and magazine catch, and point out common mistakes to avoid so your build is safe and reliable. I also cover fit checks, and a quick function test at the end so you know the lower is ready to mate with an upper. Note: always follow federal, state, and local laws when building firearms.
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Sorry to post again, but this was a bit painful to watch. After you do 15-20 assemblies, you will figure out some things that work for you. Get some roll pin holding and roll pin punches which will help you a lot, and learn to use the slave pins, I use straight punches for myself. Great effort though. Thanks
It is better to install your Mag release first, that way it doesn't hit the bolt catch when turning it in. You also don't have to push the release button in as far either.