AR15 Costs: New, Used, and Custom AR Builds

Before laying down your money for an AR-15, go through this pre-purchase checklist

Buying a new or used AR-15 rifle requires a plan and some pre-purchase inspection to make sure the juice is worth the squeeze.

Few things are sadder than falling out of love with a rifle because a blemish or quality control issue pops up post-purchase.

While there’s no way to guarantee how a rifle will perform, there are indicators of attentive manufacture that signal quality craftsmanship.

Here’s a detailed guide to help ensure a lifetime of satisfaction with your AR-15 purchase.

When investing in an AR-15, it's crucial to be aware of common pitfalls that buyers may encounter:​

Neglecting Research on Manufacturers
Not all AR-15s are created equal. Failing to investigate the reputation and reliability of different manufacturers can lead to purchasing a subpar rifle.​

Overlooking Compatibility Issues
The AR-15 platform is highly customizable, but not all parts are universally compatible. Ensure that any modifications or accessories are suitable for your specific model to avoid functionality problems.​

Ignoring Local Regulations
Firearm laws vary by location. Not being aware of your local regulations can result in legal complications. Always verify that your intended purchase complies with local laws.​

Focusing Solely on Price
While budget considerations are important, opting for the cheapest option can sometimes mean compromising on quality. Balance cost with the features and reliability you require.​

Skipping Professional Inspection
Especially when considering used firearms, not having the rifle inspected by a knowledgeable professional can lead to overlooking hidden defects or wear.

When shopping for an AR-15, buyers are often faced with three main options: new, used, or custom-built rifles.

Each option offers distinct advantages and trade-offs depending on your budget, goals, and experience level.

Here's a breakdown to help you make an informed decision.

Buying a New AR-15

Pros

• Warranty Protection: Most new rifles come with a manufacturer warranty, offering peace of mind against defects.
• Latest Features: New models often include modern components like M-LOK rails, improved triggers, and enhanced ergonomics.
• Known History: No concerns about how the rifle was used, stored, or modified by a previous owner.

Cons

• Higher Cost: Expect to pay more than a used rifle, especially from premium manufacturers.
• Limited Customization (Out of the Box): May require additional purchases or upgrades to meet personal preferences.
• Ideal For: First-time buyers or those who value peace of mind, reliability, and modern features.

Buying a Used AR-15

Pros

• Lower Price: Used rifles are often significantly cheaper than new ones.
• Potential Upgrades Included: Many used rifles come with added accessories like optics, upgraded triggers, or handguards.

Cons

• Unknown Wear and Tear: It’s hard to know how well the rifle was maintained, or how many rounds it has fired.
• No Warranty: Most used rifles are sold as-is, with no warranty or return options.
• May Require Repairs or Replacement Parts: Older or heavily used rifles might need immediate upgrades or servicing.
• Ideal For: Budget-conscious buyers or experienced shooters who can evaluate and repair used firearms.

Building or Buying a Custom AR-15

Pros

• Tailored Performance: Choose every component to match your shooting style, from barrel length to trigger pull weight.
• Unique Look and Feel: Custom builds allow for complete control over aesthetics and ergonomics.
• High Performance: With quality components, a custom build can outperform many off-the-shelf models.

Cons

• Can Be Expensive: Premium parts add up quickly, sometimes costing more than a high-end factory rifle.
• No Unified Warranty: If something goes wrong, you’ll need to troubleshoot and contact individual component manufacturers.
• More Research Required: Building or ordering a custom rifle takes time, knowledge, and patience.
• Ideal For: Enthusiasts, competitive shooters, or anyone seeking a truly personalized AR-15 experience.

When considering the purchase of a new, used, or custom AR-15, there’s more to evaluate than just aesthetics or brand name.

To ensure you're investing in a reliable, high-performing rifle, it's worth taking a closer look at the key components that directly impact function, accuracy, and longevity.

From the often-overlooked details like properly staked nuts and gas keys to the twist rate of the barrel and overall fit and finish, each part plays a crucial role.

In the sections ahead, we’ll break down what to check – from gas tube alignment and barrel quality to the handguard, trigger feel, and even the rifle’s balance – giving you a clear picture of what separates a solid AR from a problematic one.

Any AR-15 made to meet military specifications must have:

Staked Castle Nut

• The castle nut around the lower receiver extension (buffer tube) should be properly staked to keep it from loosening.
• If it comes loose, the buffer tube and stock will spin freely, making the rifle difficult to shoot.
• While you can stake the castle nut yourself, proper staking from the manufacturer is a sign of quality control.
  

*Most AR-15s will never be shot enough for either of these requirements to have any effect, but a rifle with these details done correctly indicates the manufacturer is trying to maintain a high standard.

Staked Gas Key

• The gas key on top of the bolt carrier group should be securely staked.
• This ensures the two bolts holding it in place remain tight forever. A loose gas key can cause gas to escape, resulting in cycling issues.
• Proper staking prevents guaranteed malfunctions, showing the manufacturer’s attention to detail.
  

This little detail has slipped past many new and experienced AR-buyers.

The rifling inside the barrel—known as the twist rate—is critical for bullet stabilization.

Common twist rates include:

• 1:9 Twist: Suitable for most standard ammunition found in gun stores. Works well for lighter bullets.
• 1:7 Twist: Ideal for heavier 5.56mm bullets, typically around 77 grains, and necessary for long-range precision shooting.

If your AR-15 will be used for:

• General Shooting: A 1:9 twist will suffice.
• Long-Range Precision: Opt for a 1:7 twist.
  
  

The interface between the gas tube and the bolt carrier’s gas key impacts accuracy.

Misalignment can cause movement during the cycling process, negatively affecting performance.

How to Check

• Remove the upper receiver from the lower receiver and place it upside down on a surface.
• Remove the charging handle and bolt.
• Insert the bolt carrier back into the upper receiver.
• Slide the bolt carrier back and forth while watching for gas tube movement.
• If the gas tube moves, it’s misaligned, which can harm accuracy by introducing vibration.

The barrel is one of the most critical components of an AR-15.

Look for

• Chrome Lining: Enhances durability and resists corrosion, especially useful for high-volume shooting.
• Barrel Markings: Confirm the caliber and twist rate stamped on the barrel.
• Crown Condition: Inspect the muzzle’s crown for dings or imperfections, as these can affect accuracy.

High-quality AR-15s have tight tolerances and clean finishes.

Inspect the following

• Upper and Lower Receiver Fit: There should be minimal wobble between the upper and lower receivers.
• Coating and Finish: Look for even application and no signs of wear, rust, or chipping.

The trigger directly affects shooting performance.

Test the trigger pull

• Crisp Break: A quality trigger should have a smooth pull and a clean break.
• Adjustability: Many aftermarket options allow for adjustable weight and travel.

The BCG is the heart of an AR-15.

Key points to check

• Proper Staking: As mentioned earlier, the gas key must be staked.
• Material: Look for a BCG made from Carpenter 158 steel or similar high-quality material.
• Coating: Chrome-lined or nitride-coated BCGs are durable and easy to clean.

Determine the type of handguard and rail system that suits your needs:

• Free-Float Handguard: Improves accuracy by eliminating pressure on the barrel.
• Drop-In Handguard: Easier to install but less precise for long-range shooting.
• M-LOK or KeyMod Rails: Offer modular mounting options for accessories like lights, lasers, and foregrips.

Consider the overall weight and balance of the rifle.

A well-balanced AR-15 will feel comfortable to hold and shoot for extended periods.

Lightweight builds are ideal for maneuverability, while heavier models may offer better recoil management.

Research the manufacturer’s reputation.

Companies known for quality control and excellent customer service include:

• Colt Firearms
• Daniel Defense Firearms
• Black Rain Ordnance
• Diamondback Firearms
• Smith & Wesson Firearms
  
  

Ensure the rifle comes with a warranty that covers defects and potential issues.

Buying an AR-15 is an investment, and performing a thorough pre-purchase inspection is critical.

By checking components like the castle nut, gas key, twist rate, and overall fit and finish, you can avoid common pitfalls and ensure long-term satisfaction.

When you’re ready to purchase or upgrade your AR-15, Ammunition Depot offers a wide range of accessories and ammunition to complement your rifle.

Shop online today for everything you need to enhance your shooting experience.

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