Gorilla Machining AR-15 Flip Up Sights & A2 Sights: Complete Guide to Iron Sights, Features, Compatibility, and Choosing the Right Option

Gorilla Machining AR-15 Flip Up Sights and A2 Sights provide dependable sighting solutions for AR-15 owners who prefer traditional iron sights, backup aiming systems, or a combination of optics and mechanical sights. Whether you're building a new AR-15, upgrading an existing rifle, or replacing worn components, choosing the right sight system plays an important role in the overall configuration of your firearm.

Modern AR-15 owners have more sighting options than ever before. Some prefer lightweight flip-up sights that fold flat beneath an optic, while others choose the proven durability and familiar sight picture of the classic A2 sight system. Each design offers unique advantages depending on the rifle setup, intended application, and personal preference.

Gorilla Machining offers AR-15 sighting components that include flip-up front and rear sights, A2-style front sight assemblies, fixed sight options, and compatible mounting accessories designed for Mil-Spec Picatinny rail systems. Understanding how these sights work and how they integrate with your upper receiver will help you choose the right solution for your AR-15 build.

What Are AR-15 Flip Up Sights?

Flip-up sights are mechanical iron sights that fold down when not in use and deploy into the upright position when needed.

Most flip-up sight systems include:

• Front sight

• Rear sight

• Locking mechanism

• Windage adjustment

• Elevation adjustment (depending on model)

• Picatinny mounting hardware

Unlike permanently fixed sights, flip-up sights remain folded until deployed.

This allows shooters to mount optics without permanent sight obstruction while still maintaining access to mechanical backup sights if desired.

What Are A2 Sights?

The A2 sight system is one of the most recognizable sight designs used on AR-15 rifles.

Traditional A2 configurations typically include:

• Fixed front sight base

• Protective sight ears

• Elevation-adjustable front sight post

• Rear sight assembly

• Windage adjustment

• Elevation adjustment

The A2 design has been widely used for decades and remains popular because of its simplicity, durability, and familiar sight picture.

Many AR-15 owners continue to choose A2 sights for traditional rifle builds or as part of fixed-sight configurations.

Why Choose Gorilla Machining AR-15 Sights?

Gorilla Machining offers AR-15 sighting solutions designed to work with compatible upper receivers and Picatinny rail systems.

Potential advantages include:

• Durable construction

• Lightweight options

• Rail compatibility

• Traditional A2 styling

• Modern flip-up configurations

• Backup sight capability

• Easy installation

• Multiple mounting options

Selecting the proper sight depends on the complete rifle configuration, optic setup, and personal preferences.

Flip Up Sights vs. Fixed A2 Sights

One of the most common decisions AR-15 owners face is choosing between flip-up sights and fixed A2 sights.

Flip Up Sights

Advantages include:

• Fold flat when not in use

• Compatible with many optic configurations

• Lightweight

• Low-profile design

• Backup sight capability

Flip-up sights are commonly selected for rifles equipped with red dot sights, holographic sights, or magnified optics.

Fixed A2 Sights

Advantages include:

• Traditional appearance

• Always visible

• Durable construction

• Familiar sight picture

• No deployment required

Many shooters appreciate the simplicity of fixed sights because they are immediately available without unfolding the sight.

The best option depends on the intended use of the rifle.

Front Flip Up Sight

The front flip-up sight mounts to a compatible Picatinny rail or appropriate mounting location depending on the upper receiver design.

Typical features include:

• Folding design

• Protective sight ears

• Adjustable sight post

• Locking mechanism

• Durable construction

When folded, the sight occupies minimal rail space.

When deployed, it provides a traditional front sight reference for use with a compatible rear sight.

Rear Flip Up Sight

The rear flip-up sight mounts to the upper receiver's Picatinny rail.

Common features include:

• Folding design

• Windage adjustment

• Dual aperture options on some models

• Positive locking mechanism

• Compact profile

The rear sight works together with the front sight to create the complete iron sight picture.

Proper alignment between the front and rear sight is essential.

Complete Flip Up Sight Set

Many AR-15 owners choose complete front and rear sight sets.

A matching set provides:

• Consistent height

• Matching design

• Coordinated adjustments

• Uniform appearance

Buying a complete set can also simplify compatibility compared to mixing different manufacturers.

A2 Front Sight Base

The A2 front sight base is one of the defining characteristics of the classic AR-15.

It typically serves multiple purposes:

• Front sight

• Gas block

• Protective sight housing

This traditional design has remained popular because of its durability and long history on AR-platform rifles.

Some modern rifles replace the fixed A2 front sight base with a low-profile gas block and rail-mounted flip-up sights.

Iron Sights and Optics

Many shooters use both optics and iron sights together.

Examples include:

• Red dot with flip-up sights

• Prism optic with backup sights

• LPVO with folding sights

• Fixed front sight with red dot

Flip-up sights are commonly used as backup iron sights (BUIS).

When folded, they remain out of the optic's primary sight picture until needed.

Backup Iron Sights (BUIS)

Backup Iron Sights, commonly called BUIS, provide an alternative aiming system if an optic becomes unavailable.

Potential advantages include:

• Mechanical reliability

• No batteries required

• Compact storage

• Quick deployment

• Lightweight construction

Flip-up BUIS remain one of the most popular AR-15 accessories for rifles equipped with optics.

Sight Adjustments

Most AR-15 iron sights provide adjustment capability.

Common adjustments include:

Windage

Windage moves the point of aim left or right.

Rear sights commonly provide windage adjustment.

Elevation

Elevation changes the vertical point of aim.

Depending on the sight design, elevation may be adjusted at the front sight, rear sight, or both.

Adjustment procedures vary between manufacturers.

Always follow the manufacturer's instructions.

Picatinny Rail Compatibility

Most modern Gorilla Machining flip-up sights mount directly to standard Picatinny rails.

Before purchasing, verify compatibility with:

• Upper receiver rail

• Handguard rail

• Rail dimensions

• Mounting hardware

Not every accessory rail uses identical dimensions.

Proper fit ensures secure installation.

Aluminum vs. Polymer Sights

Modern AR sights may be manufactured from aluminum, polymer, or a combination of materials.

Aluminum

Potential advantages include:

• Strength

• Durability

• Precision machining

• Corrosion resistance

Polymer

Potential advantages include:

• Reduced weight

• Corrosion resistance

• Lower cost

• Impact resistance

Material alone does not determine overall quality.

Manufacturing consistency and proper installation are equally important.

Sight Height and Rail Alignment

Front and rear sights must be designed to work together.

Important considerations include:

• Rail height

• Receiver height

• Handguard alignment

• Sight compatibility

Improper sight height can make zeroing difficult or impossible.

Matching front and rear sights from the same product family often simplifies compatibility.

Installing AR-15 Flip Up Sights

Installation is generally straightforward.

Typical steps include:

• Verify unloaded firearm

• Position sight on Picatinny rail

• Align mounting hardware

• Tighten according to manufacturer specifications

• Confirm proper lockup

• Verify sight alignment

Avoid overtightening mounting hardware.

Always follow the manufacturer's torque recommendations.

Zeroing Iron Sights

After installation, iron sights should be properly zeroed.

Zeroing procedures vary depending on:

• Rifle configuration

• Barrel length

• Ammunition

• Intended distance

Windage and elevation adjustments should be made gradually while confirming results at the appropriate range.

Choosing Between Flip Up and A2 Sights

Consider the following factors:

Choose Flip Up Sights If You Want:

• Optic compatibility

• Backup sight capability

• Low-profile storage

• Modern appearance

Choose A2 Sights If You Want:

• Traditional rifle appearance

• Always-available sights

• Proven fixed design

• Classic AR styling

Both systems remain popular for different types of AR-15 builds.

Maintaining Iron Sights

Routine inspection helps ensure dependable performance.

Maintenance includes:

• Cleaning dirt and debris

• Inspecting mounting hardware

• Confirming adjustment operation

• Checking locking mechanisms

• Looking for visible damage

Iron sights should remain securely attached to the rifle.

Loose mounting hardware should be corrected according to manufacturer recommendations.

Frequently Asked Questions About Gorilla Machining AR-15 Flip Up Sights & A2 Sights

What are AR-15 flip-up sights?

Flip-up sights are folding mechanical iron sights that deploy when needed and fold flat when not in use.

What are A2 sights?

A2 sights are traditional fixed AR-15 iron sights commonly featuring a fixed front sight base and adjustable rear sight.

What is the difference between flip-up sights and A2 sights?

Flip-up sights fold away beneath optics, while A2 sights remain fixed in position at all times.

What are backup iron sights?

Backup iron sights (BUIS) are mechanical sights used as an alternative aiming system alongside optics.

Do flip-up sights work with red dot optics?

Yes. Many shooters pair flip-up sights with compatible red dot optics as backup sights.

Are Gorilla Machining flip-up sights compatible with Picatinny rails?

Yes. They are designed for compatible Mil-Spec Picatinny rail systems.

Can I use only a front flip-up sight?

No. Accurate use requires both a compatible front and rear sight unless another appropriate sighting system is being used.

Are A2 sights adjustable?

Yes. Traditional A2 sights provide windage and elevation adjustments depending on the specific component.

Are aluminum sights better than polymer sights?

Both materials have advantages. Aluminum offers excellent durability, while polymer provides reduced weight. Overall quality depends on design and manufacturing.

How do I install flip-up sights?

Install them on compatible Picatinny rails using the supplied mounting hardware and follow the manufacturer's installation instructions.

How do I zero AR-15 iron sights?

Zeroing requires adjusting windage and elevation while confirming point of impact at the desired distance using the chosen ammunition.

Do flip-up sights interfere with optics?

When folded, they typically remain below the optic's sight picture. Compatibility depends on the optic, mount height, and sight design.

Should I choose flip-up sights or A2 sights?

Flip-up sights are often preferred for rifles using optics, while A2 sights remain popular for traditional fixed-sight builds. The best choice depends on your rifle configuration and personal preference.

What should I consider before buying AR-15 sights?

Consider compatibility, rail height, mounting system, adjustment features, construction material, optic setup, intended use, and manufacturer specifications.