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Trigger Warning: Your Guide To Upgrading Your AR-15 Trigger

Trigger Warning: Your Guide To Upgrading Your AR-15 Trigger

May 08, 2019

When you’ve totally revamped the look of your AR-15, but you're still struggling to land shots on target, you might be wondering what could be wrong. After swapping out the barrel, dropping a $400 scope on the upper receiver, and adding more KeyMod handguard accessories than you can count, you’re still not getting the accuracy you want.

But much like a performance-ready sports car, or perhaps a motivating speech delivered by a coach in a sports movie, it’s what’s on the inside that matters most. While looks might kill, you won’t hit anything if your trigger feels like you’re dragging a heavy bag of sand through a swamp before it breaks. But if you haven’t put more thought into your trigger besides keeping your booger hook off the bang switch when you’re not ready to shoot, it can be difficult to figure out where to get started.

As a leading manufacturer of AR-15 grips, stops, and more, the team at RailScales knows a thing or two about upgrading your rifle. So let’s talk about upgrading that stock trigger to something a little more useful.

Why Should You Upgrade Your Stock Trigger?

To make a long story short, stock triggers are just not great. They’re gritty. The pull is a mile-and-a-half long, and some are so stiff that you’ll wear out your tendons before you send a round down range.

Military AR-15 platform rifles typically have single-stage triggers that are not adjustable and have a trigger pull of around 5.5–9.5 pounds. While this is fine for military applications, it’s not great for those looking to make precision shots at long distances.

Having a reliable and — more importantly — predictable trigger is a great way to improve your accuracy very quickly. A smoother, lighter trigger makes the entire rifle easier to shoot. These features are especially valuable for those who are looking to compete with their rifle or take their AR-15 hunting. At the end of the day, your best shots start with the trigger and ensuring that you have a trigger that meets your needs is of vital importance if you want to do more than just leave ragged holes on paper targets.

Should You DIY Your Own Trigger Mods?

For many, when they think of upgrading their stock trigger, they think about becoming their own gunsmith. If you’re already a trained gunsmith, this might make for a fun afternoon project. However, if you’re not a trained gunsmith, we’d advise that you do not try and work on or change your existing trigger grouping in any way.

At best, you’ll damage the part, cause it to wear out more quickly, and void the warranty while you’re at it. At worst, you’ll create a point of failure that can lead to an inert rifle or one that is prone to misfires. In these cases, you’ve created a safety hazard that puts yourself and others at risk any time you load your rifle.

So with this advice in mind, it’s time to start looking for an aftermarket trigger grouping to drop into your lower receiver. While there are a ton of options out there, they really fall into just a few categories. Understanding what the distinguishing features are will help you decide which trigger is best for you.

Setting Up Your Stage Play

If you’re not familiar with the anatomy of an AR-15 trigger, it’s best to take a minute and learn about how they are put together. Your trigger mechanism features a few parts that work together. These include:

  • The trigger is the piece that you squeeze to fire the rifle.
  • The hammer is held in place by the sear until actuated by the trigger. When released, the tension pushes the hammer forward and into the firing pin within the bolt.
  • The sear is where the hammer and trigger meet. The tension of the cocked hammer sits on the sear, keeping it from firing.
  • The disconnector keeps the hammer from falling after a round was fired. It basically catches the hammer after each round fired.
  • The hook is a part of the hammer and is what the disconnector catches on while the weapon cycles. After a round is fired and the rifle cycles, the trigger resets, the hook lets go of the disconnector, and the trigger interfaces with the sear again, ready to fire.

While all triggers will feature these parts, how they make use of them and how they’re arranged will vary between triggers. As you search for a new AR-15 trigger, you’ll find you have two kinds of triggers to choose from: single stage and dual stage.

Single Stage Triggers

This is the most common type of AR trigger available. Ever M16 or M4 rifle issued in the military features a single stage trigger. In keeping with this, the vast majority of stock rifles will also come with a single stage trigger. But the quantity of these triggers has certain not diluted their quality. A single stage trigger can be used in a precision rifle quite easily.

The reason for the popularity of the single stage trigger is its design and ease of operation. The trigger engages the sear, and by pulling the trigger, the seat releases the hammer. The movement of the sear as it disengages is called creep or travel. When you release your trigger, you’ll feel or hear a click. This is the disconnector releasing the hammer and hook and the sear setting up for the next shot.

For military contract weapons, the trigger pull weight for an AR-15 single stage trigger is heavy to prevent accidental discharge. But for sporting applications, these trigger pulls can be lightened significantly, from nine pounds to four or less. A lighter trigger pull is achieved by minimizing the amount of sear engagement.

When properly trained and with a quality single stage trigger, a shooter can quickly and accurately deliver followup shots down range.

Dual Stage Triggers

Recently, dual stage triggers have experienced something of a renaissance. Often being added to a custom build by DIY-types or by custom gunsmiths, dual stage triggers were initially found on every battle rifle issued by the U.S. military until the M16.

A dual stage trigger operates exactly as it sounds. The shooter pulls the trigger back with relative ease, then hits a wall that takes more effort to break through in order to fire the rifle. It’s not unlike a double/single action pistol that already has the hammer cocked back. This design allows the shooter to have a more predictable breakpoint for their shots.

For many shooters, a dual stage trigger offers them a greater sense of control over their rifles and allows them to make more precise shots.

Trigger Faces: It’s All About Feeling

Once you’ve determined which kind of trigger mechanism you want, you next have to figure out which kind of trigger face you want. Generally, you’ll find two common trigger faces and each offers their own advantages and disadvantages. Of course, it really does come down to whichever feels best for you, but it’s still important to consider the distinguishing features.

Curved triggers are the most common triggers you’ll find. They’re used on any number of firearms, and all generally have the same shape to them. Some argue that this gentle curvature offers you an ergonomic advantage. The pad of your trigger finger more readily settles into the curve, offering you better purchase when your fingers are wet or you’re in slippery conditions. This makes curved triggers ideal for “tactical” situations, or speed shooting competitions. However, others argue that curved triggers offer less finger sensitivity, making it difficult to put your finger in the same place after each shot.

Flat triggers are exactly that. The trigger face is typically a little wider than a curved trigger as well. Some prefer a flat trigger because it offers more leverage and more surface area. This can make it easier for some to make shots more quickly. Flat triggers are generally prized for their limited amount of movement and a smoother pull. However, these advantages may be more subjective than objective.

So Which Trigger is Right For Your Rifle?

Like so many different aspects of modifying and customizing your AR-15, it comes down to personal preference. If possible, we’d suggest trying both styles of triggers. If a buddy has a dual stage trigger, for instance, see if you can take it to the range and try it out. Your perception of how the trigger feels, and how it impacts your accuracy is important.

Whatever type of trigger you decide to purchase, make sure you purchase the highest quality example you can. There’s no point in buying a cheap trigger if you have to replace it a few thousand rounds later. As the saying goes, buy nice or buy it twice.

Order Your Keymod Handguard Accessories Today

If you're upgrading your rifle, you’ll want the best products available. At RailScales, we offer a variety of handstops, rail grips, and sights that are all easily connected to your Keymod handguards. Made from high-quality materials like HTP, G10, and metal, our accessories are ready for even the most intense days at the range. Order your AR-15 parts today.