When you decide that you are ready to build your own AR-15, one of the first things you’ll need to consider is how you’ll be machining the parts and what you’ll need to get it done. Some gun builders and hobbyists choose to invest their money in expensive machinery that’s designed solely for the purchase of finishing their 80 lowers and other gun parts. The truth is, though, for most cases all you really need is a drill press and a good jig kit. 

AR-15 Jig Kits Are Worth Your Money

Don’t try to save money by not purchasing a jig kit. They are well worth the investment and can be used again and again on your AR-15 parts, making them a long-term investment in gun making. Jig kits can help save you money, too, by preventing you from making costly mistakes on your unmachined parts and making them unusable in your final AR-15. Tiny mistakes can require you to purchase more gun parts online, making the process of building your assault rifle more expensive. Jig kits aren’t the place to save money on building an AR-15; in fact, it’s a smart decision to invest in a quality jig kit. But what are you looking for when you make that purchase? We have some tips that will help you find an AR-15 jig kit that’s right for you. 

What You Want in an AR-15 Jig Kit

Made from quality materials. 

Look for jig kits that are made from steel or another tough metal. You don’t want the jig kit to bend or warp easily. It should be tough enough to withstand the usual bumps and bruises that come from being in a busy workshop. The better quality the materials are that are used to make the jig kit, the longer it’s going to last. That’s a good investment for your money.

Can be reused again and again.

You should be able to use a good jig kit again and again on multiple AR-15 projects. This has to do with the quality of material that we’ve mentioned above, but it’s also about the ease of use. A good jig kit should be like an old friend that guides you through the machining process on your unfinished lower receivers. Many gun enthusiasts end up sharing their jig kits among their friends, too, so you get even more use out of it.

Good instructions. 

Jigs aren’t hard to use once you know what you are doing. When you first use a jig kit, though, you might handle those pieces of metal and wonder what on earth they mean. In order to save confusion, time, and money, your jig kit should come with easy-to-understand step-by-step instructions. The instructions should guide you through the process and make every step of the machining pretty fool proof. Once you’ve done it once, you should be able to use your jig kit without any issues for future projects.

Comes with all the plates you need.

Pay attention to what’s included in your jig kit. Ideally, the kit should include all of the plates that you need for the left and right sides as well as the top plates, along with all of the screws and pins that are required to keep it in place. There might be a couple top plates that help you mill the fire control group, too. Don’t purchase a jig kit that doesn’t have all of this; you’ll end up buying more parts in the long run and it can make the milling process a frustrating one. 

Get Your AR-15 Jig Kit Online Today

Thunder Guns has jig kits that do all of this and more. Our jigs are made from high-quality metals that well last project after project. We also have step-by-step instructions that guide you through the process for an AR-10 or AR-15, and each jig kit that we sell comes with everything you need to get your project done. Don’t forget that you can take advantage of our special offer and save 30% on your order when you post a positive video review about one of our projects on YouTube. We’ll even throw in free shipping! Post your video and you’ll be able to save 30% on the AR-15 jig kits that you need at Thunder Guns.


  • nick
    Posted October 6, 2019 4:57 pm

    i bought my 80% lower and jig from this company and received zero instructions with the jig as well as when i tried to contact support got no response. Very well may be the last purchase I do with them.

  • Jack
    Posted November 15, 2019 1:33 pm

    I bought one of these 80% lower and jig kits at the end October, The jig kit did not come with any instructions, nor does it come with any bits or endmills. The jig itself is solid and meaty and has the bushings in the right side only for drilling the safety selector and hammer/trigger pins. I was under the impression that it could be used with a router as most others are, This jig definitely cannot be used with a router.

  • Allen Losano
    Posted April 7, 2020 5:59 pm

    I’m running into the same issues. I purchased two full ar15 pistol kits and a jig. No instructions for milling nor do they give make it easy without a milling machine. I am still waiting to hear back from them

  • Mar
    Posted May 14, 2020 5:42 am

    No instructions, No drill bushings, No bits, this is far from everything you need to complete your project!! I’m calling false advertising!! It speciffied that there would be steel drill bushings in the drill out holes and that was a straight lie!!! U won’t get too many accurate uses out of this without them!!

  • Nolan Deskovick
    Posted June 19, 2020 3:15 pm

    Customer service is non-existent. Please let all your fellow gun owners know before they make the mistake of purchasing something from this company nobody to talk to nobody to return phone calls or emails send you the wrong parts can’t complete your build or do your 80% lower help everybody not make a purchase with this company put the word out there

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