Radical Defense LS5 5.56, 1/2×28 – Top Gun Supply

Description

The Radical Defense LS5 5.56 suppressor, threaded 1/2×28, is a purpose-built sound mitigation tool for shooters who spend significant time behind AR-platform rifles. Whether you’re running drills on a private range in Texas, managing noise on a hunting lease in Pennsylvania, or simply looking to reduce the report for safer hearing at a local club, this suppressor offers a straightforward, American-made solution. It’s designed to integrate with your existing rifle setup without requiring a complete rebuild of your gas system or handguard.

What This Suppressor Is and Who It’s For

The Radical Defense LS5 is a direct-thread, multi-caliber rated suppressor built specifically for the 5.56 NATO cartridge, with the 1/2×28 thread pitch that is standard on most AR-15 barrels. It is a stainless steel and aluminum construction designed for shooters who need a durable, lightweight can for frequent use. This product is best suited for target shooters who want to reduce noise and recoil impulse during extended range sessions, as well as for hunters who need to protect their hearing while taking multiple shots. It also serves the home defense role by lowering the blast signature and sound pressure level indoors, making it a practical choice for the responsible gun owner. Collectors and builders who value consistent, domestic manufacturing will find the LS5 a solid addition to a 5.56 build.

Key Specifications Breakdown

• Caliber Rating: 5.56 NATO (also compatible with .223 Remington and 5.56x45mm)
• Thread Pitch: 1/2×28 (standard for most 5.56 AR-15 barrels)
• Overall Length: Approximately 6.5 inches (varies slightly by batch)
• Weight: Roughly 12.5 ounces (lightweight for its class)
• Construction: 17-4 stainless steel baffle stack with a 7075-T6 aluminum outer tube
• Finish: High-temp Cerakote in black (standard), resistant to carbon buildup and heat
• Mounting System: Direct thread (no additional mount required)
• Full Auto Rated: Yes, for sustained fire on select-fire hosts
• Length Added to Barrel: Approximately 6.5 inches
• Baffle Type: Multi-baffle, radial cone design for sound reduction
• Country of Origin: USA

These specifications place the LS5 in a practical middle ground: light enough for a carbine-length rifle, but long enough to provide meaningful suppression. The direct-thread mount keeps the overall system simple and reduces potential points of failure.

Feature Deep-Dive

The LS5’s core design centers on a 17-4 stainless steel baffle stack housed within a 7075-T6 aluminum tube. This combination provides a good balance between heat resistance and weight savings. The steel baffles handle the high temperatures and pressures of 5.56 NATO loads, while the aluminum outer tube keeps the overall weight low enough that it does not dramatically change the balance of your rifle. The baffles are individually machined and welded into a monolithic core, which helps maintain consistent point-of-impact shift across multiple shots.

The direct-thread mounting system is a deliberate choice for simplicity. Unlike quick-detach mounts that add length and weight, the LS5 screws directly onto your barrel’s 1/2×28 threads. This eliminates the need for a separate muzzle device and reduces the overall length of the suppressor system. For shooters who own a single 5.56 rifle and do not plan to swap the suppressor between multiple guns, direct-thread offers a reliable, low-maintenance interface. The threads are cut to tight tolerances to ensure concentric alignment with the bore.

The high-temp Cerakote finish is applied to both the aluminum tube and the steel components. This coating is designed to resist carbon fouling and thermal degradation, which is important for a suppressor that will see regular use. The matte black finish also reduces glare and helps the suppressor blend with most standard rifle finishes. The finish is applied after welding and assembly, ensuring coverage on all external surfaces.

The internal geometry of the LS5 uses a radial cone baffle design. This shape is intended to redirect and slow down expanding gases, reducing both the sound signature and the visual flash. The design also minimizes back pressure, which is a common issue with some 5.56 suppressors that can cause excessive gas blowback into the shooter’s face. The LS5’s baffle stack is engineered to keep the action cycling reliably without over-gassing the system.

Weight distribution is another considered aspect of this suppressor. At roughly 12.5 ounces, it adds noticeable weight to the muzzle end of a 16-inch barrel, but it does not make the rifle unwieldy. The length of 6.5 inches is a common compromise: long enough to achieve meaningful sound reduction, but short enough to keep the rifle maneuverable in tight spaces. This makes it suitable for both bench shooting and dynamic movement drills.

Finally, the LS5 is built with full-auto rating in mind. The materials and welding are selected to withstand the heat and pressure of sustained fire from a select-fire host. While most users will be shooting semi-automatic, this rating speaks to the suppressor’s durability under heavy use. The baffle stack is designed to resist erosion from the high-velocity 5.56 round, which is known for being hard on suppressors due to its high pressure and small bore diameter.

Ideal Use Cases

• Range Training: Reduces noise fatigue during long sessions, allowing you to focus on fundamentals without ear protection causing discomfort.
• Hunting: Suitable for varmint and predator hunting where multiple shots are common, and hearing protection is not always practical in the field.
• Home Defense: Lowers the risk of permanent hearing damage from a single shot fired indoors, while also reducing muzzle flash in low-light conditions.
• Competition: Useful for 3-gun or tactical matches where noise reduction helps with target focus and communication with range officers.

Compatibility Notes

• Ammunition: This suppressor is rated for .223 Remington and 5.56 NATO ammunition. Do not use with .22 LR or other rimfire cartridges, as the bore diameter is too small for .22 caliber. Do not use with 300 Blackout or 7.62x39mm.
• Barrel Length: The LS5 is rated for barrels as short as 10.5 inches. For barrels shorter than 10.5 inches, check manufacturer specifications for minimum barrel length restrictions.
• Thread Pitch: Only compatible with barrels threaded 1/2×28. Ensure your barrel uses this standard thread pitch. Do not use adapters that change thread pitch.
• Holsters: This is a rifle suppressor. It is not designed for use with handgun holsters. For rifle storage, use a padded case or suppressor cover when the can is hot.
• Magazines: No magazine compatibility issues. Standard AR-15 magazines work normally with this suppressor installed.
• Accessories: Direct-thread suppressors do not require additional muzzle devices. You may use a thread protector when the suppressor is not installed. Do not use crush washers or shims that could cause misalignment.

Frequently Asked Questions

Q: Can you ship this suppressor directly to my home address?
A: No. Suppressors are Title II firearms regulated by the National Firearms Act (NFA). They must be shipped to a Federal Firearms License (FFL) holder with a Special Occupational Tax (SOT) in your state. We ship to your chosen FFL/SOT dealer, not to a residential address. You will complete the ATF Form 4 transfer through that dealer.

Q: How does the FFL transfer process work for this suppressor?
A: After you place your order, we will require a signed FFL copy from your receiving dealer. Once we have that, we ship the suppressor to them. You then work with your dealer to submit ATF Form 4 (often done electronically via eForms). You will pay the $200 tax stamp to the ATF, and after approval (currently 6-12 months), you take possession. We do not handle the Form 4 process; your local dealer does.

Q: What ammunition is compatible with this 5.56 suppressor?
A: The LS5 is rated for .223 Remington and 5.56 NATO ammunition. This includes standard pressure loads, M193, M855, and most commercial hunting loads. Do not use rimfire ammunition, 300 Blackout, 7.62x39mm, or any cartridge with a bullet diameter larger than .224 inches. Avoid using armor-piercing or tracer ammunition, as these can accelerate baffle erosion.

Q: What is the warranty on the Radical Defense LS5?
A: Radical Defense offers a limited lifetime warranty to the original owner against defects in materials and workmanship. This covers baffle strikes caused by manufacturing defects, but does not cover damage from improper use, such as firing the wrong caliber, using an unaligned mount, or exceeding barrel length restrictions. The warranty is transferable only if the suppressor is sold through an authorized dealer. We recommend registering your warranty with Radical Defense after your Form 4 is approved.

Q: Can I return this suppressor if I change my mind?
A: Due to NFA regulations, all suppressor sales are final. Once the Form 3 transfer to your dealer is initiated, we cannot cancel the order or accept a return. We strongly recommend confirming your dealer is ready to accept the transfer and that you understand the NFA process before placing your order. If there is a defect or error in the product, we will work with Radical Defense to address it under warranty.

Closing Call to Action

This Radical Defense LS5 5.56 suppressor in 1/2×28 is in stock and available for shipment to your local FFL/SOT dealer. We ship to all U.S. states where NFA items are legal. If you have questions about your state’s regulations or need help locating a receiving dealer, contact our team. Place your order to start the transfer process.