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How to Build an AR-15 Part 1 – The Lower Receiver – with Jansen Jones


Hey, I’m Jansen Jones with Rob Romero and Kalani Laker for OpticsPlanet.com and today we’re gonna take you step by step on how to build an AR-15 from start to finish we’re gonna start with the lower
receiver go into the upper receiver and finish it off with how to mount a scope.
We’re also going to talk about some extra accessories that you may need for
that rifle. (gun sounds) (gun sounds) We’re professional 3-Gun Shooters with a combined 20 years of competitive shooting experience we have hundreds of
thousands of rounds to the AR-15 platform we know what works and what
doesn’t. The parts we’ve selected for this build,
we think are really great parts for both a starter rifle or a seasoned
professional Hi, my name is Jansen Jones and I am here today with OpticsPlanet.com to discuss how to build out an AR-15 lower receiver The AR-15 lower receiver commonly referred to as the lower, is what houses
your fire control group, magazine release bolt release, as well as your buffer tube, spring, buffer, and stock and grip. We’re gonna walk you step-by-step how to assemble each of these vital components. Before we begin our lower receiver buildup I wanna talk about safety I always wear eye protection when installing anything on a
lower receiver there’s a lot of small parts, springs, and detents that can come flying out at a moments notice so for that reason I would encourage you to always
have your eye protection on. I also like to wear latex gloves sometimes there’s
chemicals around or sticky material on some of the parts that I may not want on my hands for the rest of the day. So for those reasons I like to wear latex gloves too. The first step in building out your
lower receiver is to install the magazine catch, the magazine release
button’s on the right side of the lower receiver you have to first take this L-shaped
part and insert it in the left side of the lower reciever like so. You’ll then take the magazine release spring slide it in on the right side of the lower, where the mag button will be. Your mag button has got two faces: a beveled face and a smooth flat face.
You want the beveled facing outside the lower you’re gonna then take the button, depress it against the spring and start screwing it on into place. You’re going to screw
it into place until you start to get some friction against the lower, at which
point you’re gonna line it up with the mag release button port, depress it so that
it slides into the lower and you now have the L shaped part sticking out on
the left side I will then wind this part clockwise and that is threading the button onto the lower itself. And there you have it. This is the easiest step in a lower
receiver build up The next phase of our AR-15 lower build out is the bolt catch. You’re gonna take your bolt catch spring and slide it into the left side of the lower where the bolt catch detent then goes in. You’re gonna take your bolt catch and install it in the bolt catch cut out right here. And you’ll notice that it protrudes away from the lower, so you’re gonna have to line it up with the slot where you gotta drive the bolt catch roll pin in to. I like to use a punch
to hold it in place during the roll pin install like that, now you know that you’re lined up and you’re ready to go. With your bolt catch roll pin, I take a pair a needle nose pliers now before we get that roll pin all the
way in I like to use some tape whether it’s masking tape or scotch tape or blue
painters tape across the left side of the lower just in case I have any
misplaced hammer strikes that might marr the lower receiver, in this case I have three pieces
of masking tape it should do the trick now after I’ve got the roll pin started I’ll
take a heavier hammer and I’ll use it to drive the pin into position. (hammer sounds) And what you’ll see is as that pin is being driven into position the punch came out, the bolt catch
remained in place and despite having one missed hammer strake my lower receiver
still in good shape and ready to go on to the next phase. Now we’re gonna start the next phase of our lower receiver build out. We’re going to install the fire control group and the safety. Here we have a Geissele Super 3 Gun Trigger and a Seekins Precision Ambi Safety I like to install the trigger first in this case the Geissele Trigger has a slave pin to keep all the parts in place during the install which is a really nice feature I drop the trigger in To the housing like so, I’m gonna need to
depress the trigger so that it lines up with the lower of these two pin holes on the left
side or right side of the receiver. You can see the slave pin right there now I’m gonna take a trigger pin I’m gonna get it started And I’m just gonna take the plastic side of the light mallet (light mallet sounds) and tap it into place and it’s in Now you’ll notice that slave pin was driven out in the process, It’s a really nice feature of the Geissele Triggers, holds everything
in place during the install. Now we’re gonna install the safety. I’ve got my Seekins Precision Safety ready to go and the safety is a really easy part to
install slide it in and in this case I’m gonna go ahead and finish the install of this part off. By taking a wrench and a screw, and locking it in place like so if you want to be extra sure that, that screw isn’t going to walk out you could use some blue Loctite. Don’t
use red Loctite though it requires heat to break the ball. blue Loctite would be all I would use Now.. your safety, you want to just check it to make sure it’s smooth not having any hangups in there. Now we’re going to install the hammer you’re
gonna need a punch for this part of the install I take my hammer and I want to make sure that my hammer spring is aligned on the hammer like so. As I install the hammer I start from the
back I slide it into position and I use this punch to hold it in place now that allows me to use… the hammer pin and get it into position. After you’ve got your hammer
pin started you’re going to take a hammer and drive it in (hammer sounds) Now with your fire control group installed, we can check it for function. You’re gonna want to keep your thumb on the top of the hammer when you release it. And let it ease back into position, you don’t want it to strike that area at all. Now we’re ready to go onto the next phase. The next phase of our AR-15 lower build out is installing the front take down pin. you’ll notice I took my gloves off, because you’re dealing with really fine parts. You’re gonna take the take down spring slide it into position, like so. I like to use.. a Flathead screwdriver to help hold the detent in place when it’s installed. Here’s the detent sliding it into position and as it’s
going into position I’m sliding the flat head over the top of it so that it’s
depressed and locked in place it’s under pressure so you have to be careful, if you
slide that flathead screwdriver out too far that detent is gonna go. I’ll take my front take down pin and place it over the top of the flathead slide the flathead out slowly while
depressing the front take down pin into place and there we have it check it for function front take down pin is installed. The next phase of our AR-15 lower receiver build is installing: the buffer tube, buffer spring, buffer, buffer retaining pin. You’re gonna take your buffer retaining pin and spring slide into the buffer retaining pin slot
on the lower receiver toward the back near the threaded portion. You’re gonna check it to make sure its operational you just push down on it, it should spring back with no problem. Now during this build out. we’re using an A2 buffer tube you’re gonna thread it on to the lower receiver like so. What you’ll notice is as your threading it on, it’s getting closer
and closer to that buffer retaining pin you’re gonna want to depress the buffer
retaining pin with your thumb and continue to thread on the buffer until the buffer is touching the nipple of the buffer retaining pin. Now we’re gonna install the spring and buffer. With the hammer back you’re going to slide the spring into the buffer tube like so. (sliding sounds) And just keep pushing it all the way in over the buffer retaining pin and it’s installed. You can check it by compressing it with your thumb. You can also remove the buffer and spring if you need to by taking a flathead screwdriver, depressing the nipple on the buffer holding your thumb over the buffer and it will release, you could also pull the spring out (spring sliding sounds) In this phase of our AR-15 lower receiver build out we are going to install your safety selector and spring. You’re gonna take your AR-15 lower receiver and flip it over, you’re gonna see a hole by the safety. You’re gonna slide your detent, your safety detent into that hole pointy end first then you’re gonna follow by placing your lower receiver upside down back on mat block. Here we have a Magpul Grip you’re going to notice the spring space slide this right into there. You’re going to line the grip up like so you’re going to notice that spring then slide down but not come out of the grip gonna line it in the hole, I just like to work it into position with my hand sometimes it just needs a little persuasion. (hammer sounds) And it’s in position we’ll take the screw and drop it into the grip and lock it down and there you have it the grip and safety are installed you can check them for function perfect The next phase of our AR-15 lower receiver build out is installing the rear take down pin and the stock. Take your rear take down pin slide it into position you’re going to take your detent slide it into the hole, like so and follow it with the detent spring now you’ll notice I have a Magpul PRS Stock I’m simply going to slide it onto the buffer tube. I’m going to watch to make sure that it goes on straight and depresses that spring straight in to position like so then I’m gonna take the screw that connects the buffer tube and the stock i’m gonna start it like so I’m gonna finish it off with a Flathead screwdriver there’s a nice rubber buttpad that then goes on like this depresses back on the stock and you reinstall the two attachment screws that hold it in place now you have your AR-15 stock and rear take down pin installed on the lower receiver. Now let’s check the detent and the rear take down pin works great! almost finished now we’ve arrived at the final stage in our AR-15 lower receiver build out installing the trigger guard I’m gonna place my AR-15 lower receiver flat on the work bench I have a Magpul Miad Trigger guard I’m going to go ahead and slide it into position. I’m gonna take the screw which goes to the front of the trigger guard and install it first. Next, I’m gonna take: my roll pin my mallet gonna align the roll pin into position I’m gonna use the mallet to start… (hammer sounds) the pin I’m gonna finish it off with a heavier hammer. (hammer sounds) and there you have it your AR-15 lower receiver is complete

34 thoughts on “How to Build an AR-15 Part 1 – The Lower Receiver – with Jansen Jones

  1. Great info, thanks for sharing. You do not like using your punches to push in those roller pins. You scratched up the receiver with the hammer.

  2. really beat the crap out of that receiver. might want to advise using a punch to finish the pins instead of just whacking them in with a heavy hammer don't ya think?

  3. I suggest getting a different back ground. Tooooo much Black on Black on Black. How about a Sheet for some contrast and Better Lighting?

  4. 5:00 NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    That's a technique, but not the preferred technique. Holy crap, I didn't expect to see that.

  5. I guess Thor's hammer wasn't available for you to knock in the roll pins. Ever hear of a roll pin punch or maybe some pliers?

  6. That's a good way to break a trigger guard ear off of your receiver. This is a rookie install job, please do not use this guys technique, you'll ruin your parts, and mar the finish of your AR15. The only time an AR15 should show wear is copious amount of use, or you can just throw it down your driveway, like Mr. Jone would likely do. Come on Geissele, I hope this guy shoots better than he installs. FWIW, I've never used a regular hammer for trigger pins, hell a real man can push them through. Combined 20 years experience, more like 20 minutes.

  7. Best how to video I've seen by far. The instructor was great at explaining how things went together and had good tips. He had a good working knowledge of how the gun was made and operated. You can tell he doesn't do the building much though. He definitely can't swing a hammer 😂

  8. You guys have some good info but you filmed in a dark location and the guy doing the build is wearing a black shirt and black pants while building a black lower.
    And the AR vise is also black. The cameraman also likes to film from a distance…. what? Who cares! Just let see how to build the lower.
    Good try.
    Just some constructive criticism… sorry

  9. WOW, stopped watching at 8:42! The description should say ""…knowledge to build an AR-15 WITH scratch". These guys cannot be taken seriously. Bye Bye Moe, Larry, and Curly.

  10. Terrible detail. I've built many AR lowers and thank God I didn't learn from this video. I would have been lost; probably would have mixed up springs and pins. Thumbs down. Just plain bad.

  11. This would have been much better with only closeup shots of the assembly with a still camera. All the wide views of the dude and the room and the zooming in and out is too distracting and makes this difficult to watch if you’re trying to follow along as you build yours.

  12. Too many times I had mishaps installing the Bolt Catch Roll pin. I learned that lesson well. Now I drill and thread the lower. Using a pin from New Frontier Armory, installing a standard bolt catch or enhanced (Phase 5) as one example. Is a simple no worry stress free part of my builds. The same can be accomplished for Trigger Guards, and the use of a 440 set screw to install the spring and detent for rear take down pin. Taking a hammer to a basic lower or an expensive one, to me just seems barbaric. Good luck to all builders , remember drill and tap.

  13. I am just spif balling here but this type of instructional video most likely attracts those assembling a lower for the first time SO…… probably be a good idea to ACTUALLY SHOW EACH PART FOR AT LEAST A MILLI SECOND SO ONE MIGHT BE ABLE TO PROPERLY IDENTIFY PARTS RATHER THAN SAY BOLT CATCH SPRING AS YOU SLIDE IT INTO LOCATION RENDERING IDENTIFICATION IMPOSSIBLE.

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