AR-15 rifles are modular semi-automatic firearms available in a broad range of calibers, barrel lengths, handguard designs, gas systems, stocks, triggers, sights, finishes, and factory configurations. Individual models can be optimized for recreational shooting, competition, hunting, training, or other lawful sporting uses.

AR-15 Rifles

The AR-15 platform is known for modular construction and broad component compatibility. Complete rifles are offered by many manufacturers, but dimensions, materials, operating components, specifications, and compatibility can vary substantially between models.

Choosing an AR-15 Rifle

• Caliber: Compare chambering, ammunition availability, recoil, magazine compatibility, and intended application.
• Barrel: Review barrel length, profile, twist rate, material, finish, muzzle threading, and chamber specification.
• Gas System: Compare manufacturer-listed gas-system length and operating configuration.
• Handguard: Consider length, attachment interface, weight, accessory space, and overall ergonomics.
• Factory Configuration: Verify the stock, trigger, sights, muzzle device, magazine, receiver set, furniture, and included accessories.

5.56 NATO AR-15 Rifles

5.56 NATO is one of the most common AR-platform chamberings and is widely available across general-purpose, lightweight, competition, training, and optics-ready rifle configurations.

.223 Remington AR-15 Rifles

Some AR-pattern rifles are specifically chambered for .223 Remington. Cartridge compatibility should always be determined by the exact chamber marking and firearm manufacturer's instructions.

.223 Wylde Chambers

Some manufacturers offer .223 Wylde chamber configurations. Buyers should rely on the manufacturer's stated ammunition compatibility and barrel specifications for the exact rifle.

.300 Blackout AR Rifles

.300 AAC Blackout is available in numerous AR-platform configurations. Barrel length, gas system, ammunition type, magazine compatibility, and factory setup vary between models.

6mm ARC AR Rifles

6mm ARC is offered in selected AR-platform rifles oriented toward sporting, hunting, and precision applications. Bolt, barrel, magazine, and ammunition compatibility are specific to the chambering.

6.5 Grendel AR Rifles

6.5 Grendel rifles are offered by select manufacturers and may use platform-specific bolts and magazines in addition to the appropriate barrel and chamber.

.350 Legend AR Rifles

.350 Legend is available in some AR-pattern rifles and may be selected for sporting or hunting applications where lawful. Magazine and barrel specifications should be verified by model.

.450 Bushmaster AR Rifles

.450 Bushmaster is a larger-bore AR-platform chambering available in selected hunting and sporting rifles. Firearm weight, magazine configuration, barrel length, and recoil characteristics vary.

Other AR-15 Chamberings

AR-pattern rifles are available in additional chamberings depending on manufacturer and platform configuration. Not every cartridge uses the same bolt, magazine, barrel extension, or operating setup.

Barrel Length

Barrel length affects overall dimensions, weight, balance, ammunition performance, handguard selection, gas-system configuration, and legal classification.

16-Inch AR-15 Rifles

Sixteen-inch barrels are common on factory AR-15 rifles because they provide a relatively compact general-purpose configuration while meeting federal rifle barrel-length requirements without relying on a permanently attached muzzle device.

Longer AR Barrels

Eighteen-, twenty-, and longer-barrel AR-platform rifles are available for competition, varmint, hunting, precision, and other sporting applications.

Barrel Profiles

Common profiles include lightweight, government-style, medium, heavy, fluted, competition, and manufacturer-specific shapes. Barrel profile affects weight distribution and handling.

Barrel Materials

AR barrels may use chrome-moly steel, stainless steel, or other manufacturer-specified alloys. Material alone does not determine performance or expected service life.

Barrel Finishes

Manufacturers may use nitriding, phosphate, chrome lining, stainless construction, or other barrel treatments and finishes. Review the exact barrel specifications for each rifle.

Twist Rate

Twist rate describes how quickly the rifling rotates inside the barrel and is generally expressed as one rotation over a specified number of inches. Different bullet weights and designs may interact differently with various twist rates.

Gas-Operated AR Rifles

Most conventional AR-15 rifles use a gas-operated system. Component dimensions and gas-system length vary according to barrel and manufacturer configuration.

Direct-Impingement-Style Systems

Many AR-pattern rifles use the conventional gas-tube and carrier-key arrangement commonly associated with the platform. Component specifications vary by manufacturer.

Piston-Driven AR Rifles

Some manufacturers offer piston-operated AR-style rifles. Components may differ substantially from conventional AR gas systems, so compatibility should be verified before purchasing replacement parts.

Gas-System Length

Common manufacturer descriptions include pistol, carbine, mid-length, intermediate, and rifle-length systems. The exact configuration is determined by the barrel and manufacturer design.

Adjustable Gas Systems

Certain factory rifles include adjustable gas components. Owners should follow the firearm manufacturer's instructions for any adjustment or maintenance.

AR-15 Receivers

AR-platform rifles use an upper and lower receiver assembly. Materials, manufacturing methods, dimensions, coatings, controls, and compatibility can vary.

Forged Receivers

Forged aluminum receivers are common across AR-15 rifles and may use different machining, finishing, and component configurations depending on manufacturer.

Billet Receivers

Billet receivers are machined from solid material and may include styling, controls, dimensions, or features that differ from traditional forged receiver designs.

Ambidextrous AR Rifles

Some rifles incorporate ambidextrous or mirrored controls for the safety selector, magazine release, bolt catch, or other functions. Exact control layout varies by manufacturer.

Handguards

Modern AR rifles commonly use free-floating aluminum handguards, although polymer, two-piece, and other designs remain available. Length and mounting interface affect accessory placement.

Free-Float Handguards

A free-floating handguard is designed to avoid direct contact with most of the barrel along its length. Exact mounting and barrel-nut systems differ between manufacturers.

M-LOK Handguards

M-LOK-compatible handguards provide standardized accessory slots along selected surfaces. Rail sections and other compatible accessories can be mounted where the handguard design permits.

Picatinny Rails

Picatinny rail sections are widely used for optics, sights, lights, bipods, and other compatible accessories. Verify placement and accessory compatibility for the rifle.

AR-15 Stocks

Factory rifles may include fixed or adjustable stocks. Stock configuration affects length of pull, weight, storage dimensions, and shooting ergonomics.

Adjustable Stocks

Adjustable stocks provide multiple length positions on compatible receiver extensions. Adjustment range and design differ by stock manufacturer.

Fixed Stocks

Fixed stocks provide a non-collapsing rear configuration and may use different receiver-extension or buffer-system components from some adjustable-stock configurations.

Pistol Grips

AR-15 pistol grips are offered in different angles, textures, widths, storage configurations, and ergonomic shapes.

Triggers

Factory AR triggers differ in pull weight, shape, travel, reset, and construction. Some rifles include single-stage systems while others use two-stage or manufacturer-specific designs.

Single-Stage Triggers

Single-stage triggers generally provide one primary movement toward the break. Characteristics vary by manufacturer and model.

Two-Stage Triggers

Two-stage triggers provide an initial stage followed by a distinct second stage before the break. They are common on some precision and competition-oriented rifles.

Charging Handles

Charging handles vary in latch size, width, shape, material, and ambidextrous operation. Compatibility can depend on upper-receiver design.

Bolt Carrier Groups

Bolt carrier groups may differ in bolt material, carrier profile, coating, finish, testing, caliber compatibility, and manufacturer-specific construction.

Forward Assist

Many conventional AR upper receivers include a forward-assist assembly, while some manufacturers offer slick-side or simplified receiver configurations without one.

Ejection Port Covers

Many AR rifles include a spring-loaded ejection-port cover designed to help shield the action when closed. Receiver configurations vary.

Muzzle Devices

Factory rifles may include flash hiders, muzzle brakes, compensators, thread protectors, or other manufacturer-installed muzzle devices.

Flash Hiders

Flash-hider configurations vary in dimensions, mounting method, thread pitch, and manufacturer design.

Muzzle Brakes

Muzzle brakes are designed to redirect propellant gases and may change recoil characteristics, muzzle movement, sound, and blast.

Compensators

Compensators are designed to influence muzzle movement by directing gases through manufacturer-specific port configurations.

Threaded Muzzles

Many AR barrels are factory threaded. Thread pitch depends on caliber and barrel specification, so accessory compatibility should always be verified.

Optics-Ready AR Rifles

Many modern AR-15 rifles use flat-top upper receivers with rail space for compatible red dots, prism optics, LPVOs, scopes, or iron sights.

Red-Dot Sights

Red-dot sights are commonly used on AR-platform rifles for range, competition, training, and other sporting applications. Mounting height and rail compatibility should be considered.

LPVO Scopes

Low-power variable optics are frequently paired with AR rifles and provide variable magnification within the optic's stated range. Appropriate rings or mounts are required.

Prism Optics

Prism sights use an optical prism system and are available with fixed or limited magnification depending on the model.

Backup Iron Sights

Some rifles include factory iron sights while others are sold without sights. Folding or fixed backup sights may be added when compatible with the rail and gas-block configuration.

Accessory Compatibility

AR-platform rifles support a wide range of compatible optics, sights, slings, bipods, lights, grips, rail accessories, and other sporting equipment. Fit should always be verified for the exact rifle and mounting interface.

Sling Mounts

Stocks and handguards may provide QD sockets, sling loops, M-LOK mounting points, or other manufacturer-specific attachment options.

AR Magazines

Magazine compatibility depends on caliber, lower receiver, cartridge dimensions, magazine design, and manufacturer configuration. Not every AR-pattern cartridge uses a standard 5.56-style magazine.

Magazine Capacity

Factory magazine capacity varies by model, cartridge, manufacturer, distributor package, and jurisdiction.

Overall Weight

Rifle weight depends on barrel profile, handguard, receiver construction, stock, optic, sights, muzzle device, and installed accessories.

Lightweight AR Rifles

Lightweight rifles may use slimmer barrels, reduced-mass handguards, minimalist stocks, or other components intended to reduce overall weight.

Precision-Oriented AR Rifles

Precision-focused configurations may use longer or heavier barrels, upgraded triggers, adjustable stocks, free-float handguards, and optics-oriented receiver setups.

Competition AR Rifles

Competition rifles may incorporate specialized triggers, muzzle devices, handguards, stocks, grips, controls, or sighting systems. Configuration requirements depend on the shooting discipline.

Hunting AR Rifles

AR-platform rifles are available in several chamberings used for lawful hunting. Cartridge, magazine, firearm-feature, and season requirements vary by jurisdiction and game species.

AR-15 vs. AR-10-Style Platforms

AR-15 and larger AR-style rifle families can look similar but use different receiver dimensions, cartridges, bolts, magazines, and other components. Parts should not be assumed interchangeable.

Cleaning an AR-15 Rifle

Follow the firearm manufacturer's instructions for unloading, field stripping, cleaning, inspection, lubrication, and reassembly. Procedures and maintenance intervals vary by model.

Bore & Chamber Maintenance

Cleaning products, brushes, patches, and other equipment should be compatible with the firearm's caliber, barrel material, and finish.

Bolt Carrier Maintenance

The bolt and carrier assembly should be cleaned, inspected, and lubricated according to manufacturer guidance.

Gas-System Maintenance

Gas-system components should be inspected according to the firearm manufacturer's maintenance schedule. Owners should avoid unauthorized modifications that could affect safe operation.

Magazine Maintenance

Magazines should be kept clean and inspected for damaged bodies, feed lips, followers, springs, and other components.

Ammunition Compatibility

Use only ammunition specifically approved for the exact firearm chambering. Cartridge markings that appear similar do not by themselves establish compatibility.

5.56 NATO & .223 Remington

Chamber specifications matter when evaluating 5.56 NATO and .223 Remington ammunition. Follow the firearm manufacturer's stated ammunition compatibility for the exact barrel and chamber.

Reloaded & Specialty Ammunition

Manufacturer policies regarding reloaded, remanufactured, steel-case, specialty, or higher-pressure ammunition vary. Review the owner's manual and warranty requirements.

AR-15 Rifle Storage

Rifles should be stored securely according to applicable law, household circumstances, manufacturer instructions, and responsible firearm-storage practices.

Rifle Cases

Hard and soft rifle cases are available for storage and transport. Internal dimensions should account for optics, muzzle devices, magazines, grips, and other installed accessories.

Gun Safes

Long-gun safes and secure storage systems are available in various sizes, locking configurations, and interior layouts for controlled firearm storage.

Transporting an AR-15 Rifle

Firearm transportation laws vary by jurisdiction and destination. Secure cases, vehicle storage, ammunition, and local requirements should be reviewed before travel.

Legal Configuration

Barrel length, stock configuration, overall firearm configuration, state restrictions, magazine limits, and other features can affect legal requirements. Buyers should verify current applicable law for the exact firearm.

State & Local Restrictions

Some jurisdictions regulate certain semi-automatic rifle features, magazine capacities, configurations, transfers, or possession. Restrictions can change over time and should be verified before ordering.

FFL Transfer Requirements

AR-15 rifles purchased online generally must be transferred through a federally licensed firearms dealer when required by applicable law. Buyer eligibility and transfer requirements depend on the transaction and jurisdiction.

Factory Rifle vs. Individual Components

Complete factory rifles are sold as assembled firearms under a manufacturer's specific model configuration. Parts and components listed elsewhere may have different compatibility, regulatory, or installation considerations.

Manufacturer Variations

AR-15 rifles that appear similar can differ significantly in barrel, chamber, gas system, bolt carrier group, trigger, receiver, handguard, stock, muzzle device, sights, finish, and included accessories.

Compare Exact Model, SKU & UPC

Verify the manufacturer's model number, SKU, UPC, caliber, barrel length, twist rate, gas system, handguard, stock, trigger, magazine, sights, muzzle device, finish, and included equipment before ordering.

Always Verify Manufacturer Specifications

AR-15 rifle chambering, barrel length, twist rate, gas system, receiver construction, trigger, stock, handguard, sights, magazine capacity, muzzle configuration, accessory compatibility, weight, finish, included equipment, and legal configuration vary by manufacturer and model. Always review the current manufacturer's specifications for the exact rifle being considered.