Building Your AR Lower Receiver

By CTD Rob published on in Firearms, How To

So, you finally bought a stripped lower receiver and all the goodies that go along with it.

You excitedly tore open the box and checked to make sure we shipped you all the parts you needed to put together your first AR lower. You glare at the pile of parts and think to yourself, “Now what?”

Last year, we produced a series on how to put together the complete AR-15 lower receiver. As most of you know, the lower receiver houses the magazine catch, bolt catch, pivot pin, fire control group, trigger guard, selector, grips, pins and buffer tube. We still field a ton of questions about how to put these parts together, so we thought a rehash was in order. Installing these parts is fairly simple, and most people can do it without too many issues. However—when working on any firearm—if at anytime you feel you aren’t sure about what you are doing, take it to a qualified gunsmith.

 

Step 1: Installing the Magazine Catch

 

Step 2: Installing the Bolt Catch

 

Step 3: Installing the Pivot Pin

 

Step 4: Installing the Fire Control Group

 

Step 5: Installing the Trigger Guard

 

Step 6: Installing the Selector and Pistol Grip

 

Step 7: Installing the Takedown Pin and Buffer Tube

 

Stay Tuned!

Hopefully, this clears up some of the confusion. Once you do this a few times, most of the steps will become second nature. Stay tuned for more posts on AR builds. We’re going to pull some parts from the warehouse so we can throw together some uppers and barrels to see what we can come up with!

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Comments (46)

  • John

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    Videos were much clearer than what I’ve been able to get off of YouTube. Well done!

    I appreciate the efforts of people who post to YouTube, but sometimes, like trigger group installation, their hands actually cover up what they’re doing so you can’t, for example, see how the springs are oriented.

    Reply

  • VT Patriot

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    Beautiful video, clear, concise, well filmed. I wouldn’t hesitste to tear open a box with a lower kit in it and start right on it. Thanx, great job.

    Reply

  • Kevin

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    Thanks CTD more Info to help counts never ever stop learning or think we know it all! what we do not know we don’t we all have to start some where we need each other if Oboyo is re elected and becomes King of oboyo land forward the Omerica Flag of change we will !

    Reply

  • Tecstar1

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    Excellent video. I would have included staking the castle nut as many people are unsure how to properly perform that operation or they use loctite that may be difficult to remove later on.

    Reply

  • Jon H

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    Excellent videos! As a 21 year Army Soldier and an AR owner, I learned a lot! I’m inspired to build one so keep them coming.

    Reply

  • Carl

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    Very good video. I agree with bill on the hex wrench. Being inside a cardboard box when you do it the first time, is not a bad idea. That little detent can make you sweat when you are looking for it on carpet. Voice of experience. And yes, I did find it after about 30 seconds of ‘very’ intense looking with a flashlight.

    Reply

  • Bill Albritton

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    Better, straight forward, and more clear than the out-of-date AGI video (I have it and too much BS in the video).

    Nice trick with the hex wrench for the pivot pin.

    Reply

  • Yes Sir

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    Great videos…..very detailed…which more detail is better. Keep em coming.

    Reply

  • O'banma

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    Exactly what I’m looking for being this close to election time. Get that lower built so it can be grandfathered into a possible weapons ban

    Reply

  • Mike

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    Great videos, really makes me want to build my own lower. Thanks

    Reply

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