AR-15 Accessories & Upgrades | Mounts, Stocks & More

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Featured Accessories

The featured products on this page are selected to represent the major parts of the Mounts Plus AR catalog. Instead of showing hundreds of similar products at once, this shorter collection gives you a practical starting point across optics, furniture, controls, support equipment, maintenance gear and other common upgrade categories.

What Should You Upgrade First?

Start with the problem you want to fix. That usually leads to a better purchase than choosing an accessory simply because it is popular.

Choosing Accessories That Fit Your Rifle

The AR platform is highly modular, but modular does not mean universal. Before ordering, check the mounting interface, dimensions and manufacturer fitment information for the part you are replacing or adding.

Handguards & Rail Systems

A handguard changes support-hand space, accessory placement, balance and the mounting interfaces available at the front of the rifle. Our AR-15 handguard selection includes free-float, drop-in, M-LOK, Picatinny, quad-rail and lightweight options.

Before choosing one, compare actual length, mounting system, barrel-nut requirements, inside diameter, gas-block clearance and installed weight. A handguard that looks right but interferes with another component is not the right upgrade.

Stocks & Buffer Systems

Stocks affect cheek weld, length of pull, shoulder contact and overall handling. But stock fitment also depends on the receiver extension and recoil system already on the rifle.

Use the stocks and buffer systems section to compare stocks, buffer tubes, buffers and recoil springs. Check whether the stock and receiver extension are designed to work together rather than ordering by appearance alone.

Grips, Foregrips & Hand Stops

Small ergonomic changes can have a noticeable effect on how naturally the rifle fits your hands. Grip angle, texture, size and support-hand position all matter.

Browse AR grips, foregrips and hand stops and make sure rail-mounted products match your M-LOK, Picatinny or other mounting interface.

Optics, Sights & Mounts

Choosing an optic is only part of the sighting setup. Mount height, available rail space, eye position and mounting footprint can be just as important.

The optics, sights and mounts section brings red dots, scopes, backup sights, risers and mounts together so you can match the sighting system to the rifle instead of treating the optic and mount as unrelated purchases.

Triggers & Lower Controls

A trigger or control upgrade should solve a specific ergonomic or functional preference. Safety selectors, bolt releases, magazine controls and trigger components can all change how the lower receiver feels.

Shop triggers and lower controls and check the manufacturer's compatibility information for the exact component before ordering.

Upper Receiver & Gas-System Components

Charging handles, gas blocks and other upper components have more specific fitment considerations than many external accessories.

Use the upper receiver and gas-system parts section to compare options and verify dimensions, gas-system requirements and surrounding component clearance.

Muzzle Devices

Muzzle brakes, compensators and flash hiders are designed around different priorities, and some products combine more than one function.

When browsing muzzle devices and recoil-control products, confirm thread pitch, caliber compatibility and any manufacturer-specific installation requirements before ordering.

Lights, Slings & Support Gear

A light is only useful if its mounting position works with your grip and controls. A sling depends on having the correct attachment hardware. A bipod needs a compatible mounting interface.

Browse lights and lasers or slings, bipods and support equipment with the entire mounting setup in mind rather than choosing each part separately.

M-LOK vs. Picatinny

M-LOK and Picatinny are both common accessory-mounting systems, but they work differently. M-LOK uses elongated slots in the handguard and allows compatible accessories or rail sections to be installed only where needed. Picatinny uses a raised standardized rail with transverse slots and works with a very broad range of mounts and accessories.

Many modern handguards combine the two by using a Picatinny top rail with M-LOK slots on the sides and bottom. Check the mounting interface on both the rifle and the accessory before ordering.

AR-15 vs. AR-10 Compatibility

Do not assume a product that fits an AR-15 automatically fits an AR-10 or another .308-pattern rifle. Some external accessories work across several platforms, while internal parts, handguards, buffer-system components and other hardware may use different dimensions or patterns.

When a product supports multiple platforms, that compatibility should be specifically listed by the manufacturer.

Popular Brands

Mounts Plus carries AR products from established manufacturers across nearly every major upgrade category, including Magpul, Midwest Industries, Trijicon, EOTech, Streamlight, Geissele, PRI, Strike Industries, Superlative Arms, Timber Creek Outdoors, Wheeler, B5 Systems, Samson Manufacturing and other well-known brands.

Brand reputation is useful, but fitment should come first. Compare the exact product specifications, mounting interface, dimensions, weight and intended application before choosing one product over another.

Looking for Recommendations?

If you want a shorter list of specific products instead of browsing every category, visit our Best AR-15 Accessories guide. It is designed to help narrow the catalog by upgrade type and gives the broader shopping category a separate home from recommendation-focused content.

Shopping on a smaller budget? Browse AR-15 accessories under $50 for affordable grips, mounts, small parts, tools and other upgrade options.

Why Shop at Mounts Plus?

Mounting Solutions Plus specializes in firearm mounting systems and accessories and carries products across the AR platform, from optics and rails to stocks, controls, support gear, maintenance equipment and replacement parts.

Learn more about Mounting Solutions Plus, or review our shipping and return policy before ordering.

AR-15 Accessories FAQ

What accessories should I consider first?

Start with whatever addresses the biggest limitation in your current setup. Common starting points include a sighting system, sling, stock or grip, handguard and appropriate mounting hardware. If low-light use matters, a compatible weapon light may also belong high on the list.

What upgrades make the biggest difference?

That depends on the rifle and the shooter. Optics can change the sighting setup, stocks and grips affect fit, handguards change support-hand position and mounting space, and slings affect carry and retention. The most useful upgrade is usually the one that solves an existing problem.

Are AR-15 accessories universal?

No. Some external rail accessories work with a wide range of rifles, while stocks, handguards, gas-system components, muzzle devices and other parts can have specific compatibility requirements.

Will AR-15 accessories fit an AR-10?

Not automatically. Some products support both platforms, but AR-15 and AR-10 components can use different dimensions or patterns. Check the manufacturer's fitment information before ordering.

How do I know whether my handguard is M-LOK or Picatinny?

Picatinny uses a raised rail with repeated cross slots. M-LOK uses elongated rectangular slots cut into the handguard. Accessories must either match the mounting system directly or use a compatible adapter.

How do I know whether a stock will fit?

Check the receiver extension and the stock manufacturer's compatibility specifications. Adjustable and fixed stock systems can use different components, so verify the complete setup before ordering.

What should I check before buying a muzzle device?

Confirm barrel thread pitch, caliber compatibility and any mounting or dimensional requirements supplied by the manufacturer.

Should I upgrade the handguard first?

A handguard is worth considering when you need more accessory mounting space, a different support-hand position or a different front-end configuration. If your current handguard already does what you need, another upgrade may provide more practical benefit.

What is the difference between AR-15 parts and accessories?

The terms overlap. Accessories generally include add-on equipment such as optics, slings, bipods and lights. Parts more often refers to components used in the rifle itself, such as controls, springs, lower parts and gas-system components.

Where can I find affordable AR upgrades?

Visit the AR-15 Accessories Under $50 category for lower-priced mounts, grips, small parts, tools and related products.