How to Take Fingerprints For an NFA Application

Posted by Gunbuilders.com on May 16th 2025

We recently covered how to register a short-barreled rifle with the ATF, as part of the National Firearms Act (NFA). One of the most important -- and, for many, complicated -- parts of the process is acquiring a set of fingerprints to provide with your Form 1 or Form 4 application. But getting finge …

DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At GunBuilders.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

How to Register an SBR (2025 eForms Instructions)

Posted by Gunbuilders.com on Mar 17th 2025

So, you're ready to ditch that 16" upper and pistol brace. Or maybe you're building a fresh rifle from scratch, and you need to register your receiver before you install a buttstock. Here's how to register a short-barreled rifle (This Covers Form 1 SBRs) Note that these instructions cover how to fil …

DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At GunBuilders.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

How to Lap Your AR-15 Upper (Instructions & Photos)

Posted by Gunbuilders.com on Mar 16th 2025

Bought a match-grade barrel? Assembling a long-range .308 setup with a stainless target plinker? The build quality of your barrel comes first, but the quality of the upper receiver you install it in can be just as important -- especially if you want proper optic and iron sight alignment with as few …

DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At GunBuilders.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

AR-15 Gas Port Diameters: What's Best?

Posted by Gunbuilders.com on Mar 11th 2025

We recently covered why dwell time is so important for your AR's ability to cycle reliably. The length of your gas system determines dwell time, which determines how much gas flows into your bolt carrier group to cycle the action. Too much gas causes excess recoil and wear and tear. Too little gas m …

DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At GunBuilders.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

What is Dwell Time? Why it Matters For Your AR's Gas System

Posted by Gunbuilders.com on Mar 11th 2025

There are a lot of AR-15s running the wrong gas system length, which can make your rifle, SBR, or pistol unreliable. The wrong gas system can can cause excessive recoil and increased wear, or it can cause short strokes, poor cycling, and frequent jams. If your AR's suffering any of these issues …

DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At GunBuilders.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

Sig P365 Sizes & Models Compared (With Dimensions!)

Posted by Gunbuilders.com on Feb 4th 2025

With more than a dozen models available -- and with different models sharing grip modules, slides, barrels, and calibers -- figuring out the P365's dimensions, and which model you may want to configure or buy can get confusing. We've collected the dimensions for all models to make it easy! P365 Mode …

DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At GunBuilders.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

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