Tag Archives: Lower

Wheeler Tool Makes AR Trigger Guard Installation or Removal a Breeze

I was asked how I install AR trigger guards to minimize scratching up the receiver or even risking snapping an “ear” off.  On one hand, you can use a solid backing block to support the ear and then use a roll pin punch to drive in the pin.  That’s what I used to do but it’s a headache to be honest.  As some of you may know, I have a tremor that makes fine motor stuff a headache so finding methods that are simpler really helps me get work done.

This is a Brownells Billet 7075 aluminum trigger guard (078-101-164) and it has a bulge to accomodate gloves.  The set screw goes in the end with a blind hole.  The roll pin goes through the end that is drilled all the way through.

A few years ago I started using the Wheeler trigger guard tool and it works great.  Here’s my process:

  1.  Install the end of the triggerguard that uses the set screw.  That’s the end with the blind hole – the roll pin goes in the end where a hole goes all the way through.
  2. I lightly oil the pin to make things easy and tap it with a small hammer just to get it started.
  3. I then use the Wheeler tool with the shorter starter pin.  The starter pin has a nipple that centers it on the roll pin.
  4. Keep the parts aligned and turn the knob to drive the pin in.
  5. Stop when you have inserted the pin – it’s that easy.

Note, Scott Igert of Modern Antique Firearms recommends you put a business card or something between the frame and your receiver to protect it from scratching.

It has two tips – here you can see one installed and one stored in the frame of the tool.  The short one is for installing and the long one is for pushing a roll pin out.
Simply stop once the pin is flush.

Note, I actually have one from another maker also.    I’m holding it in my hand.  It does the same conceptually but is heavier made.  I’ve built probably 4-6 ARs with the Wheeler unit and it seems to be holding up fine.  The other is a Little Crow unit from Brownells for about $39.99 + S&H and its built like a tank but you do pay more for it.

Little Crow Trigger Guard Pin Pusher

I hope this helps you out.  


If you find this post useful, please either buy something using one of the links to eBay and Amazon.  With Amazon, if you click on one of our links and then buy something else – even unrelated stuff like clothes, electronics and groceries – we get credit and it would be hugely appreciated.  Doing something like the above will help us fund continued development of the blog.





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Wheeler Trigger Guard Install Tool (Sports)

Makes installing or changing trigger guards quick and easy. Precisely control and install the trigger guard roll pin to prevent damage to the receiver. The old method of hammering the roll pin into the receiver can easily damage your serialized lower.

Features: 
  • Comes with an install pin and an uninstall pin
  • Pins conveniently store in the frame
  • Durable construction, made of aluminum with a mil-spec anodized finish
List Price: $22.79 USD
New From: $22.84 USD In Stock
buy now

Assembling an AR Lower – Step 4 of 11: Installing the Pivot Pin Assembly

The AR is a modular rifle system wherein the upper half connects to the lower half via two pins.  The front pin is known as the “pivot pin” because when the rear pin is opened, the upper half can pivot up allowing for maintenance or to allow the operator to open the pivot pin also and entirely remove the upper for a different model thus allowing tremendous versatility.  This is why AR owners can readily swap calibers, barrels, etc. to really tailor their weapon to the task at hand.

Now, when it comes to assembling the lower, there is one big headache when installing the front pivot pin.  To keep it from falling out, there is a spring and a tiny detent pin in front of it that will want to launch like a rocket across the room if you aren’t careful.  This is one step where I would tell you to wear eye protection – you may think this is a joke but it honestly is not.  That detent is tiny and it seriously can come flying out.

Don’t even think about trying to install that pin without a tool to help. I am going to give you a real strong recommendation – buy a pivot pin assembly tool or at least buy a 1/4″ universal clevis pin if you are just doing a single build.  The purpose-built tools are dirt cheap and you can find them everywhere – Amazon, Brownells, Primary Arms, Midway USA, etc.  I think I bought my first off eBay but I have several because several armorer’s kits I have bought over the years included one.  They all basically look like this:

If you don’t want to spend the money on the tool, a 1/4″ clevis pin works just fine.  A regular 1/4″ clevis pin is $0.95/ea and a universal pin is a $1.50 at my local Ace Hardware & either will work just fine.  You then use a punch or an allen wrench to push the detent and spring down.  Some of the commercial tools on the market are nothing more than a clevis pin with an allen key so it is up to you as to which to use.

There are two sizes to reflect the two types of receivers that are out there and most AR receivers will use the smaller 1/4″ end.  The bigger pin was a Colt ban-era move they did to try and prevent a M16 upper from being put on a sporting lower.  For anyone doing a build today with a current upper and lower – it will be the 1/4″ size.  You will see there are two pins with your lower build kit,  The relatively flat one is for the rear and the one with the large shoulder is the front pivot pin.  So in the next photo, the pivot pin is the lower pin.  You can also see the small double ended detent – either end can be first down the hole – and one of the detent springs.  Both takedown pins use the same detent and spring.  By the way, I recommend buying one of the reputable spare parts kits and throw it in your tool box just in case. I can’t tell you how many springs, pins and small parts I have dropped and lost over the years.

To make life interesting, a detent spring is inserted into this receiver hole followed by a detent pin on top of it.  The detent pin is what actually makes contact the pivot pin.  This is always the case with AR rifles and it makes sense.  If the spring contacted a rotating pin directly it would break down over time.  In terms of pins, I prefer enlarged takedown pins.  The ones I use the most are Yankee Hill Machine (YHM) pins that I get at Brownells.  They just make it easier for me to disassemble whatever rifle or pistol I am working on.

     

The actual installation is very straight forward if you have tool or clevis pin.  Push the tool in so the hole of the tool is over the hole in the receiver and then insert the spring and the detent pin.  The pin will stick up some so you then push it down with the little plunger tool.  Simply rotate the tool and the spring and pin are adequately captured – now leave the tool there for the next step. Note, in the photo with the spring, it is at an angle just for the photo.  To drop in, everything is straight up and down the axis of the receiver.   Also, wear eye protection – if that detent pin comes flying out, you don’t want it to hit you in the eye!

I always grease the channel in the pivot and rear takedown pin so they can slide easier.  I like Tetra Gun Grease so that is what you see in the photo but you could use whatever grease you prefer.  Always keep the old saying in mind – if it slides, grease it.  If it rotates, oil it.

Now this is the only tricky part left.  If you have not done so already, remove the plunger so the tool can slide back out but leave the main part of the tool in place with the spring and detent pin captured.  Take the pivot pin with the channel facing up (so the pin will not engage it), carefully line it up with the tool, push down and forward to slide the tool out and replace it with the pivot pin.  You need the slight downward pressure to keep the detent pin and spring from flying out.  Once you see the pivot pin coming through the left lobe/hump, you can remove the tool and rotate the pivot pin into final position with the detent pin riding in the channel.

That’s it!  The pivot pin should slide open and closed with the detent catching at either end.  Note, this may be a tight fit as the parts wear in.  I would not recommend sanding the pin or reaming the hole unless you know for sure the hole is out of spec.  Grease the pin and work it in and out.  It should loosen up with time as the parts get to know each other.

For folks who choose to do this with a clevis pin, it is the same procedure but with the clevis pin and a punch or allen key to do the work.  These next photos are just so you can get an idea of how it works.  I simply grab whatever punch or allen key that will fit down the hole of the clevis pin to serve as the plunger.  I didn’t grease the mil-spec pin as I just did this to take photos.  Here I am just using a plain $0.95 clovis pin and a small punch to serve as the plunger.  If I had rotated the pivot pin at the end, it would have been a done deal but I took it back apart as I will use the YHM pin when I decide how I want to build this next lower.

So this step is done!  I hope it helps.  In the next step I’ll install the trigger assembly.


 

If you find this post useful, please either buy something using one of the links to eBay and Amazon.  With Amazon, if you click on one of our links and then buy something else – even unrelated stuff like clothes, electronics and groceries – we get credit and it would be hugely appreciated.  Doing something like the above will help us fund continued development of the blog.


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AR-15 Adult's T-shirt Assault Rifle 2nd Amendment Tee for Men - 1290V

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AR-15 Adult's T-shirt Assault Rifle 2nd Amendment Tee for Men - 1290V

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AR-15 Adult's T-shirt Assault Rifle 2nd Amendment Tee for Men - 1290V

$13.08
End Date: Wednesday Feb-6-2019 19:53:51 PST
Buy It Now for only: $13.08
Buy It Now | Add to watch list

AR-15 Adult's T-shirt Assault Rifle 2nd Amendment Tee for Men - 1290V

$12.90
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AR-15 Adult's T-shirt Assault Rifle 2nd Amendment Tee for Men - 1290V

$13.08
End Date: Wednesday Feb-6-2019 19:53:51 PST
Buy It Now for only: $13.08
Buy It Now | Add to watch list

Here is a link to the YHM pins at Brownells.

Do some shopping on Midway, Brownells, Palmetto and Primary Arms for spare parts / field repair kits.  They will have springs, detents, gas rings, etc.  If you plan on doing a number of builds, you may want to just buy a number of the “most likely to lose” items.  I have a collection of a bit of everything now it seems.

I don’t recall the brand of pivot pin tool I am using.  I have 2-3 from various deals over the years.  They all work provided they are a 1/4″ with a hole 🙂

Here is the Wheeler unit at Midway.




Very Good AR Lower Assembly Guide Web Pages – Not videos

So in my last blog post, I gave you a number of Youtube videos you can watch to learn how to assemble an AR lower.  In this post, I’ll give you some web pages where you can visit them and read step by step instructions with photos.  This way, you can print you the pages and have them by you for reference if so desired.  As with the videos, check out all of the links and see how the authors do the assembly of their AR lowers.

First off, AR15.com has an assembly guide you can check out:
http://www.ar15.com/content/guides/assembly/lower/

Here is one from the Arms Guide:
http://thearmsguide.com/3277/how-to-build-an-ar-15-lower-receiver-tools-and-components/

The Truth About Guns has a guide:
http://www.thetruthaboutguns.com/2012/06/foghorn/ask-foghorn-assembling-an-ar-15-lower-receiver-from-a-stripped-receiver/

The New Rifleman does as well:
http://www.thenewrifleman.com/how-to-build-a-lower-receiver/

 

I hope this helps you out!




Very Good AR Lower Receiver Assembly Videos on Youtube

Have you ever wondered how to assemble an AR lower receiver and were curious  what free resources are available?  I spent some time on Youtube and collected  a list of videos that show the viewer how to assemble a lower receiver for an AR-type rifle.  I would recommend watching several as each presenter’s methods has pros and cons plus there are different details and camera angles in some cases.

“Gunsmithing – How to Build an AR-15 Lower Receiver” by MidwayUSA


“EASIEST AR15 lower build diy, step by step” by dutchofsc

“AR-15 Lower Receiver” by bgallaher77


I really liked all of the above and hope you find them useful.