When you’re investing in an AR‑15 upper, there’s one thing that matters more than marketing claims, fancy coatings, or brand hype: whether the rifle runs well when you pull the trigger. At Mid State Firearms, we take that responsibility seriously — which is why every complete upper is properly assembled in‑house, headspaced, and test‑fired before […]
Most shooters start with 5.56 or .300 Blackout and then run into limits on range, hunting laws, suppressed use, or power. At that point, what calibers fit AR15 stops being a theory question and becomes a build decision. If you need a basic overview of common rounds, you can read our beginner’s guide to AR-15 […]
The gas system sets the character of an AR-15. It touches recoil feel, where heat and carbon go, what you’ll spend, and how the rifle behaves with a suppressor. Most builds stay with direct impingement (DI). Others choose a Piston Driven AR15 (short-stroke or long-stroke).This article explains how both systems work, what they do well, […]
Handguards do three things well: they shield your support hand from heat, provide mounting for lights and grips, and help the rifle balance the way you like. On the AR platform, there are two main approaches: drop-in and free-float. This guide explains both and shows where each one makes sense so you can choose the […]
Have you ever wondered exactly how an M4 rifle works? Then you are in the right place. In this guide, we will walk you through the parts of an M4 in a way that’s beginner-friendly, detailed, and suitable for both beginners and firearm enthusiasts. This blog post will introduce you to each part of an […]
When you are assembling or upgrading an AR-15, the bolt carrier group (BCG) is one of the parts where you really shouldn’t skimp. The BCG serves as the core of the rifle operating system since it is a part that carries out loading and unloading of the rounds, extracting the spent brass, and performing reliable […]
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