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Old 04-14-2019, 10:55 PM   #1
AKXTC2
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Default How to Assemble AR-15 Lower

I know we have a 'build it yourself' section, but this is AR specific.
If Nails will let it ride this may encourage some folk to attempt a lower build.
The AR-15 section has been lacking, except for burninglegs pushing LaRue triggers, and we could all use encouragement and a laugh.
This guy makes it look so easy. I may try one.



https://youtu.be/yj2NJQFMorw
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Old 04-14-2019, 10:58 PM   #2
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Old 04-14-2019, 11:03 PM   #3
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It really is easy. Give it a try. The pivot pin is probably the hardest to do without scuffing up your lower, but you can get a $10 tool that makes it really easy.
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Old 04-14-2019, 11:13 PM   #4
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Thanks Commiblockakspecialist.
My mojo ain't working tonight for some reason.

Okay wetfloor, thanks. I may grab me a Snek or Gadsen Palmetto and one of those tools.
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Old 04-14-2019, 11:30 PM   #5
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Originally Posted by Commiblockakspecialist View Post
What in the actual fuck is the point of that stupid ass video??

I do like da way he talk tho.
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Old 04-14-2019, 11:31 PM   #6
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Lowers literally only take a few minutes to build. I wouldn't even call it a build. More like "some assembly required".
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Old 04-14-2019, 11:53 PM   #7
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Lowers literally only take a few minutes to build. I wouldn't even call it a build. More like "some assembly required".
Unless the pivot pin detent shoots out into the nether world!

You don't need a $10 tool to install that. Clevis hitch pin from Lowe's for $1. Next lower I build I will have a baggie over the pivot pin to restrain the possible launch.
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Old 04-14-2019, 11:59 PM   #8
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Originally Posted by ÄÄCHMED HÄZÄÄMÄT View Post
Next lower I build I will have a baggie over the pivot pin to restrain the possible launch.
Look at Mr. Fancypants here with his baggie.

Too good to use a pillow case like the rest of us
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Old 04-15-2019, 12:08 AM   #9
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Back in the day I used to assemble these by the dozen. Done a few more lately too!

Pivot pin is easy. Clip a few coils off the detent spring until it sits just below flush. Insert detent (with dab of grease on it to hold in place) and carefully push it back into the hole with the pivot pin (turned so the groove is facing up) then insert the pin partway into it's hole in the receiver. Twist pin until detent snaps into groove. Done, no tools required except for a pair of wire cutters. Never had one shoot loose yet, and it is easier to pop out for stripping.

The hard part is getting the roll pin into the bolt hold open without scratching the side of the receiver. A long roll pin punch helps, along with a helper to tap on the punch while you hold everything in place. The real sphincter tightener is driving in the triggerguard roll pin, I use a stack of large washers to support the bottom side ear as I drive it in but I always clench up until it goes in all the way and the ear doesn't break off!

If you plan on doing more than 1, invest in one of those "emergency easily lost parts kits" that have several of the detents and springs in them, usually $5-10. you will need it eventually! PSA knows what they are doing, their lower parts kits include an extra detent and spring.
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Old 04-15-2019, 05:34 AM   #10
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I also have a large clear bag that I made out of a plastic painter's drop cloth (packing tape on the seams).

I place the lower inside it to install the front pivot pin. I utilize the $0.49 clevis pin tool as well, & am unlikely to fire a detent into oblivion anymore, but I still assemble inside the bag...

The next best tool to buy, is a specialized bolt catch installation punch 2-pack (holder & drift punch) from Wheeler Engineering. Makes life a ton easier.

You will need a set of roll pin punches at minimum, & you're off to the races...

Over the years now, I have acquired roll pin holders & punches, upper & lower vice blocks, trigger test devices, trigger guard roll pin tools, extended thin shank taps for tapping the complete length of the grip screw holes (for $0.99 trigger jobs)... You name it, I probably got it...
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Old 04-15-2019, 07:42 AM   #11
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Quote:
Originally Posted by KernelKrink View Post
Back in the day I used to assemble these by the dozen. Done a few more lately too!

Pivot pin is easy. Clip a few coils off the detent spring until it sits just below flush. Insert detent (with dab of grease on it to hold in place) and carefully push it back into the hole with the pivot pin (turned so the groove is facing up) then insert the pin partway into it's hole in the receiver. Twist pin until detent snaps into groove. Done, no tools required except for a pair of wire cutters. Never had one shoot loose yet, and it is easier to pop out for stripping.

The hard part is getting the roll pin into the bolt hold open without scratching the side of the receiver. A long roll pin punch helps, along with a helper to tap on the punch while you hold everything in place. The real sphincter tightener is driving in the triggerguard roll pin, I use a stack of large washers to support the bottom side ear as I drive it in but I always clench up until it goes in all the way and the ear doesn't break off!

If you plan on doing more than 1, invest in one of those "emergency easily lost parts kits" that have several of the detents and springs in them, usually $5-10. you will need it eventually! PSA knows what they are doing, their lower parts kits include an extra detent and spring.
I put masking tape over any areas that will get scratched up doing any given task, especially the bolt release pin. The easy way to avoid breaking the ears off of the trigger guard pin is to buy a closed trigger guard receiver.
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Old 04-15-2019, 08:27 AM   #12
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I have found the Wheeler AR Armorer's Bench Block to be pretty helpful with putting the lower together and front sight pin removal/install if you get to that point. They also have a combo tool for the bolt catch and pivot pin installation that works well. Hats off to the gents who have used baggies, bed sheets and masking tape. My ingenuity is very time limited, however probably more nature limited.
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Old 04-15-2019, 11:11 AM   #13
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I don't recommend any one guide, but someone put this together recently that may be of some help to people:
Here

Also, put some moly grease on the threads of the receiver extension and castle nut. Lastly, stake your castle nut -- no loctite!
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Old 04-15-2019, 11:23 AM   #14
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I have this guys video's downloaded and saved on my Desktop.

https://www.youtube.com/channel/UCZk...FuREehZiAp-xsw

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They also have a combo tool for the bolt catch and pivot pin installation that works well. Hats off to the gents who have used baggies, bed sheets and masking tape. My ingenuity is very time limited, however probably more nature limited.
Agreed.
For $9 , I would rather not chance shooting the tiny pieces into carpet and searching
Been there, done that........screw that. Skip to the 24 second mark to see what we're talking about
This is without the proper tool........lol

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Old 04-15-2019, 12:56 PM   #15
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Quote:
Originally Posted by ÄÄCHMED HÄZÄÄMÄT View Post
Unless the pivot pin detent shoots out into the nether world!

You don't need a $10 tool to install that. Clevis hitch pin from Lowe's for $1. Next lower I build I will have a baggie over the pivot pin to restrain the possible launch.
I just used the tip of a sharp knife tbh.
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Old 04-15-2019, 01:09 PM   #16
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They usually give you spare pins. my 4th build last month saw a pin fly into the netherworld. I had spares, thank God
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Old 04-15-2019, 04:04 PM   #17
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I don't get much use from videos though watching someone do it helps sometimes. I like posts/pics better, this is what I used when I started assembling AR's for myself, whatever you think of the site itself, it has some nice resources and how-to's:

https://www.ar15.com/forums/ar-15/As...ons-/4-226782/
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Old 04-15-2019, 04:14 PM   #18
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Quote:
Originally Posted by Aceshigh View Post
I have this guys video's downloaded and saved on my Desktop.

https://www.youtube.com/channel/UCZk...FuREehZiAp-xsw



Agreed.
For $9 , I would rather not chance shooting the tiny pieces into carpet and searching
Been there, done that........screw that. Skip to the 24 second mark to see what we're talking about
This is without the proper tool........lol


1:44 of the video.. those are a pain in the ass. I found them on sale one day and I bought 4 of them. I only installed 1, lol. I gave the other 3 to friends of mine. They only cussed for a little bit.


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Old 04-15-2019, 06:17 PM   #19
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I 'assembled'my first lower for my first AR, with the help of a friend who had done em.

So simple that my 2nd AR, I bought a jig kit and milled a 80 lower.

Outside of my first AR, wont ever own another AR with a serial number. It's too simple to mill/assemble your own. Took 3/4 of a day, at a leisurely pace, to mill, rattle can the lower, assemble it.

If only AKs were as simple... lol
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Old 04-15-2019, 06:37 PM   #20
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Pivot pins are easy. No need to cut springs or any other mods. Put spring and pivot into hole, hold in place with razor blade or exacto knife. Push pin through with round side towards pivot pin. Slide out razor blade, twist takedown pin till it engages. Done in 10 seconds.
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Old 04-15-2019, 06:56 PM   #21
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Its super complicated and requires specialty tools as shown:

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Old 04-15-2019, 07:33 PM   #22
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The bolt catch pin can be driven in with an automatic center punch. Just hold the lower in a padded vise and use needlenosed pliers to hold the pin while driving it with the automatic center punch. I made a small pin punch to remove the pin. It has a small reduced diameter tip to fit inside the roll pin and is just a bit smaller in diameter than the hole. It is only 2" long and used with the automatic center punch. A small finish nail can be used to make it. Just protect the receiver with tape...works easier than punch & hammer.
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Old 04-15-2019, 08:50 PM   #23
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I used to struggle with the roll pin for the trigger guard, hated those damn things I’d beat the crap out of them to get them in. Now I just use my vice and press them in super easy not sure why I didn’t do that from the go.
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Old 04-15-2019, 11:16 PM   #24
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Op it's addicting and the more you do the faster you get.
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Old 04-16-2019, 09:06 AM   #25
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Default Khyber Pass builds

Sheit I can slap on a complete build huddled on the couch like a Khyber Pass gunsmith I only lost one pin and like everything small and metal my shop floor ate it never to be found......
It always just starts putting the mag release in, next thing I knew I was tapping in pins lololol, Wife says “your ridiculous”

I guess thats what my shops for
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Old 04-16-2019, 11:03 AM   #26
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Quote:
Originally Posted by oakhandledsks View Post
Its super complicated and requires specialty tools as shown:

That's really how Bubba does it.
A soft face hammer, roll pin punches, small channel locks, a fine file, Allen wrench, and castle nut wrench are all you need. All can be had for under $50.
Plus some lube, rags, and a block of wood.
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Old Yesterday, 11:58 PM   #27
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Thanks for all the suggestions.
The Files really has a mixed up bag of some great guys, if I do say so myself.
Or is it a great bag of some mixed up guys?

Anyway, thanks again.

And after searching lowers and stocks and triggers separately and adding up the costs, I still just purchased two PSA complete lowers with NiB 2 stage triggers.
I guess I'll keep my two 'parts sets' as spares stuff for the AR15 arsenal.
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Old Today, 08:40 AM   #28
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Need some enabling?

https://palmettostatearmory.com/psa-...-receiver.html

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Old Today, 04:40 PM   #29
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Buy a hockey puck.
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