Elevate Your AR Platform: Discover the Alexander Arms .17 HMR Complete Upper Assembly

Are you an AR-15 owner looking to expand the versatility of your rifle without investing in an entirely new firearm? Do you seek a highly accurate, low-recoil option perfect for small game hunting, varmint control, or cost-effective target practice? The Alexander Arms .17 HMR Complete Upper Assembly is precisely engineered for individuals like you, offering a seamless and powerful caliber conversion that unlocks new shooting possibilities for your existing AR lower receiver. This comprehensive upper provides a ready-to-go solution for those who demand precision, reliability, and the convenience of an AR-style platform in the popular .17 Hornady Magnum Rimfire cartridge.

Unlocking New Capabilities with the .17 HMR Caliber

The .17 HMR (Hornady Magnum Rimfire) has carved out a significant niche in the shooting world, celebrated for its flat trajectory, impressive velocity, and exceptional accuracy, especially at ranges typically associated with larger centerfire cartridges. For AR owners, integrating this caliber through a dedicated upper assembly offers numerous advantages:

• Pinpoint Accuracy: The .17 HMR is renowned for its inherent accuracy, making it an excellent choice for precise shot placement on small targets or paper. This upper assembly is designed to maximize that potential.
• Varmint Hunting Prowess: If you're dealing with prairie dogs, groundhogs, coyotes, or other small predators, the .17 HMR's speed and flat shooting characteristics ensure clean, ethical takedowns at extended rimfire distances. It's often considered superior to the .22LR for these applications due to its higher velocity and flatter trajectory.
• Economical Practice: While not as inexpensive as .22LR, .17 HMR ammunition is still significantly more affordable than most centerfire cartridges, allowing for more trigger time without breaking the bank. This makes it ideal for honing marksmanship skills.
• Low Recoil Experience: The minimal recoil of the .17 HMR makes for a comfortable shooting experience, enabling faster follow-up shots and extended shooting sessions without fatigue. This is particularly beneficial for new shooters or those seeking a pleasant plinking session.

By simply pinning this Alexander Arms upper to your existing AR-15 lower, you transform your rifle into a highly capable rimfire precision instrument, ready for a variety of tasks from competitive shooting to pest eradication.

Engineered for Excellence: Key Features and Benefits

The Alexander Arms .17 HMR Complete Upper Assembly is not just a collection of parts; it's a meticulously crafted system designed for optimal performance. Each component plays a crucial role in delivering the accuracy and reliability Alexander Arms is known for.

The Precision 18" Stainless Threaded Barrel

At the heart of this upper assembly lies its 18-inch stainless steel barrel. The length is optimally chosen to allow the .17 HMR cartridge to achieve its full ballistic potential, maximizing velocity and extending effective range.

• Stainless Steel Durability: Stainless steel is highly resistant to corrosion and wear, ensuring the barrel maintains its integrity and accuracy over thousands of rounds. This material choice contributes to the longevity and consistent performance of the upper.
• Enhanced Accuracy: Longer barrels often contribute to improved accuracy by providing a longer sight radius and allowing for more stable bullet flight before exiting the muzzle. The precise manufacturing of Alexander Arms barrels further enhances this inherent accuracy.
• Threaded for Versatility (1/2-28RH): The barrel is threaded with a common 1/2-28RH pitch. This standard threading opens up a world of possibilities for customization. Whether you're looking to attach a different muzzle device, a compensator to further reduce muzzle rise, or a suppressor for quieter shooting, this threading ensures compatibility with a vast array of aftermarket accessories.

Optimized Twist Rate: 1:9 for .17 HMR

The 1:9 twist rate is specifically chosen and optimized for the lightweight, high-velocity projectiles typical of the .17 HMR cartridge.

• Bullet Stabilization: A barrel's twist rate determines how quickly the bullet spins as it travels down the bore. A 1:9 twist provides the perfect amount of spin to stabilize the small, aerodynamic .17 HMR bullets (typically 17-20 grains), ensuring they maintain their trajectory and accuracy over distance. An incorrect twist rate can lead to bullet instability, keyholing, and reduced accuracy.
• Consistent Performance: By matching the twist rate precisely to the bullet type, Alexander Arms ensures that every shot fired through this upper assembly delivers consistent, predictable results.

Effective Muzzle Device: A2 Flash Hider

Equipping the upper with a classic A2 Flash Hider serves several practical purposes:

• Flash Suppression: The primary function of a flash hider is to reduce the visible muzzle flash, especially beneficial in low-light conditions to preserve the shooter's night vision and conceal their position.
• Recoil Mitigation (Minor): While the .17 HMR has minimal recoil, the A2 flash hider can contribute to a slight reduction in felt recoil and muzzle rise, allowing for even faster follow-up shots and better control.
• Protecting Barrel Threads: It also serves as a protective cap for the barrel threads, preventing damage when no other muzzle device is installed.

Reliable Blowback Operating System

The Alexander Arms .17 HMR upper utilizes a simple yet highly effective blowback operating system.

• Simplicity and Reliability: Blowback systems are known for their fewer moving parts compared to gas-operated systems, leading to increased reliability and easier maintenance. This design is perfectly suited for the rimfire .17 HMR cartridge.
• Cleaner Operation: Without a gas system to foul, the blowback operation results in a cleaner running upper, reducing the amount of carbon buildup and extending the time between cleanings.
• Direct Recoil Management: The blowback system efficiently manages the .17 HMR's recoil, contributing to the overall smooth shooting experience.

Sleek and Durable Black Finish

The upper receiver and other components are finished in a durable black coating.

• Corrosion Resistance: This finish provides an additional layer of protection against the elements, resisting scratches, abrasions, and corrosion, ensuring the upper maintains its appearance and functionality even with heavy use.
• Aesthetic Appeal: The classic black finish matches most standard AR-15 lower receivers, ensuring a cohesive and professional look when assembled.

Ready-to-Shoot: Two 10-Round Magazines Included

Understanding the need for immediate functionality, Alexander Arms includes two 10-round magazines with this complete upper assembly.

• Immediate Use: You can attach the upper to your lower receiver and begin shooting right away, assuming you have .17 HMR ammunition.
• Capacity for Compliance and Practice: The 10-round capacity is suitable for most shooting applications, including target practice and hunting, and complies with various state regulations on magazine capacity. Having two magazines allows for quicker reloads during extended shooting sessions.

Lightweight Design: Only 4.5 lbs

Weighing in at a mere 4.5 pounds, this complete upper assembly keeps your overall rifle setup light and maneuverable.

• Reduced Fatigue: A lighter rifle is easier to carry in the field for extended periods, reducing shooter fatigue during long hunts or training sessions.
• Enhanced Handling: The reduced weight contributes to quicker target acquisition and easier transitions between targets, especially in dynamic shooting scenarios.
• Balanced Feel: Despite its lightweight nature, the upper is designed to maintain a balanced feel when paired with a standard AR-15 lower, providing comfortable and controlled shooting.

Seamless Conversion with Included Parts Kit

Perhaps one of the most significant advantages of this Alexander Arms upper is the inclusion of a parts kit for lower receiver conversion. This means you don't need to hunt for additional components or worry about compatibility issues.

• Effortless Integration: The kit contains necessary components to ensure your existing AR-15 lower is fully compatible with the .17 HMR upper, allowing for a smooth and reliable operation. This typically involves a dedicated buffer and spring tuned for the blowback system.
• True "Drop-In" Solution: This thoughtful inclusion makes the Alexander Arms .17 HMR upper a truly complete, ready-to-use solution for transforming your AR-15 into a highly versatile rimfire rifle. It eliminates guesswork and ensures reliable function right out of the box.

Who Benefits Most from This Upper Assembly?

This Alexander Arms .17 HMR upper assembly is an ideal choice for a diverse range of shooters:

• The Varmint Hunter: If your property or hunting grounds are plagued by small pests, the .17 HMR's precision and flat trajectory make it an unbeatable tool for dispatching them efficiently and humanely.
• The Target Shooter/Plinker: Enjoy extended range sessions with accurate, low-recoil ammunition. Perfect for honing your marksmanship skills at distances beyond typical .22LR capabilities without the cost of centerfire rounds.
• The AR-15 Enthusiast Seeking Versatility: Expand the capabilities of your existing AR platform. Why buy a whole new rifle when you can simply swap an upper and gain an entirely new caliber?
• The New Shooter: The minimal recoil and user-friendly AR platform make this an excellent choice for introducing new shooters to rifle fundamentals without intimidation.
• The Prepared Individual: Having a rimfire conversion offers a cost-effective way to maintain shooting proficiency and provides a reliable small-game harvesting tool for various situations.

Why Alexander Arms is a Trusted Name

Alexander Arms has a long-standing reputation for innovation and quality in the firearms industry. Founded by Bill Alexander, the company is known for pioneering new calibers like the .50 Beowulf and .6.5 Grendel, demonstrating a deep understanding of ballistic science and firearm engineering. When you choose an Alexander Arms product, you're investing in:

• Innovative Design: Their commitment to research and development ensures that their products are at the forefront of firearm technology.
• Superior Craftsmanship: Each upper assembly is built with meticulous attention to detail and high-quality materials, ensuring reliability and longevity.
• Performance Focus: Alexander Arms products are designed with the shooter in mind, delivering exceptional performance, accuracy, and ease of use.

This Alexander Arms .17 HMR Complete Upper Assembly (UPC 819511021295, SKU UST-17ST) embodies these principles, offering a premium solution for expanding your AR-15's capabilities. It’s a testament to quality engineering that transforms your existing rifle into a highly effective rimfire precision tool. You can find this and other high-quality firearms components readily available at DEGuns, a trusted source for your shooting needs. Their commitment to offering reputable brands like Alexander Arms ensures you receive genuine, performance-driven products.

Frequently Considered Aspects for .17 HMR Uppers

When considering an upper assembly like this, shooters often ask about various aspects. Here are some answers to common thoughts:

• Is it easy to install? Absolutely. Converting your AR-15 to .17 HMR with this complete upper is a simple process. It involves separating your existing upper from your lower receiver and pinning this Alexander Arms upper in its place. The included parts kit ensures seamless operation.
• What kind of accuracy can I expect? The .17 HMR is inherently accurate, and with its 18-inch stainless barrel and optimized twist rate, this upper is capable of delivering sub-MOA (Minute of Angle) groups with quality ammunition, especially at appropriate rimfire distances. This means consistently hitting targets with remarkable precision.
• How does it compare to a .22LR conversion? While .22LR conversions are more common and ammunition is cheaper, the .17 HMR offers significantly higher velocity, a much flatter trajectory, and superior terminal performance for small game and varmints at longer ranges. If long-range precision and effective small-game hunting are priorities, the .17 HMR is the clear winner.
• What maintenance is required? Thanks to the blowback operating system, this upper runs cleaner than gas-operated centerfire uppers. Regular bore cleaning and light lubrication of the bolt assembly are typically all that's needed to maintain optimal performance and longevity.

Whether you're looking to enhance your varmint hunting arsenal, increase your precision shooting capabilities, or simply enjoy more affordable and comfortable target practice, the Alexander Arms .17 HMR Complete Upper Assembly offers an outstanding solution. Its robust construction, thoughtful design, and the inclusion of essential accessories make it a comprehensive package for any AR owner ready to experience the impressive capabilities of the .17 HMR cartridge.

Product Specifications

Feature	Detail
Caliber	.17 HMR
Barrel Length	18 inches
Barrel Material	Stainless Steel
Threading	1/2-28RH
Twist Rate	1:9
Muzzle Device	A2 Flash Hider
Operating System	Blowback
Finish	Black
Magazines	Two 10-Round Magazines
Weight	4.5 pounds
Included	Parts kit for lower receiver conversion
UPC	819511021295