Tools you need to Build an AR-15

So you want to build an AR15? The parts are only half the battle when it comes to building your AR. After picking out your parts, you probably are wondering what tools you need to build an AR-15?

Several years ago, I assembled my very first AR. It was a great day but a long one because I didn’t have all the tools I needed to make the build as quick and easy as possible.

So lets dive in and take a look at the minimum tools needed to build AR-15.

Work Bench/Clear Surface

I’ve built a many AR at my kitchen table, but it’s not the ideal surface.

My poor kitchen table has taken the scuff, scratch, and nick from assembling AR15’s and it worked just fine.

However, as time went on and I knew I would be building and working on more AR’s, I upgraded to a work bench in my barn.

The workbench provided a clean and clear surface for me to place tools and parts during assembly. It really worked great to have a bench built just for rifle building.

I built my own bench and attached my vice to it. It is necessary to have a sturdy bench to attach a vice to.

You can overbuild your bench as much as you want, even using metal if that’s your cup of tea. Mine is just a heavy wood bench that’s several hundred pounds, and it does the trick.

With that being said lets move on to the vise.

Bench Vise for AR-15

A vise isn’t an optional item when it comes to building an AR15. At least not if you want to build your rifle into a reliable weapon.

Vise

A vise allows you to use an AR block kit, a Gisselle rod, or an upper clamp block. I personally prefer the rod, more on that in the next section.

You want to have a secure vise that is large enough to hold your rod or block kit. A general rule is to have a vise that has a jaw size of at least 4″.

I have this TEKTON 4-Inch Swivel Bench Vise. Works perfect for me!

AR-15 Vice Block/Rod/Upper Clamp

This is one of the most important tools for building an AR. If you are building the upper, you’ll want to make sure you have either the reaction rod or the upper vice block.

AR Tool Rod

My personal favorite is the Geissele Reaction Rod, which lets you slide the upper onto the rod and then torque the barrel nut and handguard with ease.

The Geissele reaction rod is probably the #1 tool used by gunsmiths and gun manufacturers. So this makes it a must-have tool in your AR build tool kit.

The other option holding your upper in the vice is the upper vice block, which I’m not a huge fan of because it can leave marks on your upper if the clamp is over-tightened.

If you want to hold your lower, you can use a lower receiver vice block for seating the mag well in and working on your lower receiver while it’s in the vice.

AR-15 Torque Wrench

Torque wrenches are a magic tool for building your AR-15. A torque wrench allows you to properly attach your barrel nut to the upper receiver.

AR Tool: Torque Wrench

Since the barrel and castle nut components are essential for a safe and reliable AR don’t skip out on purchasing a torque wrench for your AR-15 build tool box.

High end, Made in the USA: CDI Micro-Adjustable Torque (Brownells) CDI 1/2″ Torque (Amazon)

AR-15 Armorers Wrench

I’m torn on an if you need an armorers wrench and maybe that’s because I’ve not bought a quality one.

AR15 Armorers Wrench

If you are using a handguard with a proprietary barrel nut, this might not be a must-have.

Most muzzle devices can be tightened with just a simple adjustable wrench or a torque wrench if you know your correct poundage.

The only reason I say you need one is for the castle nut, which is the nut that goes on your buffer tube.

So grab one if you’d like. I’d recommend researching to make sure this is the best tool for your needs.

If you are gonna buy one here is my recommendation: Brownells AR-15 Armorers Wrench

Punch Set

A punch set is not something I’d go cheap on. Buy a high-quality punch set, and your AR-15 building life will be a much better one.

Cheap dollar store punch sets don’t stand up to the wear and tear. Even just one AR build will put them through hell and back.

Even if you only plan to build one rifle, still get a good punch set. You never know when you’ll need a set of good punches.

This set of punches on Brownells is a really good option, but not the cheapest option.

Roll Pin Holders

Roll pin holders, also known as starter punches, allow you to put your roll pins into the punch and “getter started!”

These make things so much easier than holding a roll pin with your fingers and trying to hammer them home. Pliers are even a pain when trying to start roll pins.

You can buy them as a set, which is what I recommend, or individually: Brownells – Roll Pin Holders

Hammer/Mallet

Obviously, to send these roll pins home, you need to have a hammer and/or mallet. Arguably this is the most important tool to build an AR.

Hammer & Mallet AR Tools

Without a good hammer and mallet, those roll pins are gonna avoid going home worse than Happy Gilmore’s golf ball when he first started golfing!

ARE YOU TOO GOOD FOR YOUR HOME?!

I have a standard steel hammer with a fiberglass handle for when the roll pins need to be shown who’s boss.

I also have a multi-use mallet that has a soft side and a hard plastic side. This mallet has been invaluable when it comes to building AR’s.

The hard plastic side of the mallet keeps you from damaging the finish of your gun unnecessarily.

Hex/Allen Wrench Set

Having a solid set of hex/Allen keys is critical.

Allen Wrench Set

I have been operating with the above mess for quite some time. I highly recommend picking up an organized set of hex keys to save you time and headache.

The T-Handle sets are by far my favorite: T-Handle Hex Tool Set w/Stand.

You will need several regular hex keys and possibly even a star hex key set. I really like the Prohold Star Tip T-Handles from Brownells.

The star keys are becoming a much more popular tool for AR’s due to more contact points on the tool making it less likely to strip out a screw.

Screwdriver Set

While you shouldn’t need many screwdrivers to build an AR completely, I would make sure you have a flathead that is long enough to fit in the pistol grip to tighten it down.

AR Tools Screwdrivers

Here’s mine. Now obviously mine is overkill but I’ve had this flathead FOR EVER. So, it works.

Keep in mind older A2 style pistol grips used a hex key bolt to secure the grip to the receiver so you’ll need a longer enough hex key to attach those style grips to the receiver.

If you have a Magpul MOE or other modern pistol grip, you don’t need to worry because those have a dual flathead and Phillips head bolt.

If you are all about Made in the USA, then this set from Grace USA with wooden handles should be your go-to!

Tools to Build an AR-15 Summary

All of the tools to build an AR-15 listed here are recommendations, and not all are requirements. Some of them you’ll absolutely need if you want to assemble your own rifle.

If you are building an AR-15 pistol consider taking a look at our AR-15 Pistol Carry Case guide.

Here’s our complete list of recommend tools with links to purchase:

Disclaimer: These are affiliate links, and we do make a small commission at no additional charge to you. They help us continue creating content like this for you, our reader!

We also offer excellent rifle cases, both tactical and discreet, for your new AR-15 build.

If you have any feedback or tool recommendations we missed, be sure to leave a comment below!

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