ARMSLIST – For Sale: Alexander Arms 50 Beowulf Rifle w/ Ammo 50 Caliber AR

Description

The .50 Beowulf cartridge was developed with a specific purpose in mind: delivering overwhelming force at close to intermediate ranges, making it a practical choice for hunters facing large or dangerous game and for homeowners who prioritize substantial barrier penetration. This Alexander Arms rifle, chambered in that formidable caliber, offers a distinct platform for those who require a shoulder-fired arm that can decisively address threats or take game like wild boar and black bear. As a licensed FFL retailer, we present this rifle as a specialized tool for specific, lawful applications within the United States.

What This Product Is and Who It’s For

This is a factory-built Alexander Arms AR-15 style rifle chambered in .50 Beowulf, featuring a 16-inch threaded barrel. It is intended for shooters who need a semi-automatic rifle with significantly more terminal energy than standard 5.56mm or .223 Remington rounds. This rifle is well-suited for hunters in states that permit straight-walled cartridges or require larger calibers for certain game, as well as for homeowners who want a platform that can maintain effectiveness through common building materials. It also appeals to collectors and enthusiasts who appreciate the engineering behind a large-bore AR platform that operates within the standard AR-15 lower receiver dimensions. This is not a general-purpose plinker; it is a purpose-built firearm for those who understand the ballistic trade-offs of increased caliber and recoil.

Key Specifications Breakdown

• Caliber: .50 Beowulf (0.500-inch diameter projectile)
• Action: Semi-automatic, direct impingement gas system
• Barrel Length: 16 inches (threaded, 5/8×24 thread pitch)
• Barrel Profile: Heavy contour, 4140 steel with a black finish
• Overall Length: Approximately 35 inches (collapsible stock extended)
• Weight: Approximately 8.5 to 9.0 pounds (unloaded, without optics)
• Magazine Capacity: Accepts standard AR-15 magazines (typically 10-round magazines for .50 Beowulf due to cartridge length; a 7-round magazine is often included)
• Upper Receiver: Forged 7075-T6 aluminum, flat-top with Picatinny rail
• Lower Receiver: Forged 7075-T6 aluminum, standard AR-15 with a collapsible stock
• Trigger: Mil-spec single-stage
• Sights: None included; flat-top receiver requires optics or separate iron sights
• Finish: Hardcoat anodized black (upper and lower receiver)
• Muzzle Device: A2-style flash hider (threaded for suppressors or compensators)
• Included Accessories: One 7-round magazine, Alexander Arms .50 Beowulf ammunition (quantity varies by listing, typically 20 to 50 rounds), and a hard case or box

Feature Deep-Dive

The 16-inch threaded barrel is a central feature of this rifle, balancing maneuverability with the velocity needed to maximize the .50 Beowulf’s ballistic performance. At 16 inches, the barrel is long enough to achieve reliable powder burn for the large case capacity while remaining short enough for use in confined spaces, such as a home or vehicle. The threading (5/8×24) allows the attachment of muzzle devices like compensators to manage recoil, or suppressors if local and federal regulations permit. The heavy contour profile helps dissipate heat during sustained firing and adds stability to the platform, reducing felt recoil impulse compared to lighter barrels.

The gas system is tuned specifically for the .50 Beowulf cartridge, which operates at higher pressures than standard 5.56mm. Alexander Arms uses a dedicated bolt carrier group and a modified extractor to ensure reliable cycling with the large rimmed case. This is not simply a re-barreled AR-15; the upper receiver is machined with a larger ejection port to accommodate the .50 Beowulf’s case dimensions. The bolt face is also cut specifically for the cartridge, preventing case head separation or feed issues that can occur with aftermarket conversions. This factory integration means the rifle has been tested for function and safety with the intended ammunition.

The lower receiver is a standard AR-15 pattern, which offers flexibility for the end user. You can install any aftermarket trigger group, pistol grip, or collapsible stock that fits a mil-spec lower. The magazine well accepts standard AR-15 magazines, though the .50 Beowulf cartridge’s length limits capacity to about 7 to 10 rounds depending on the magazine body. Alexander Arms typically includes a 7-round magazine designed with a modified follower to prevent bolt override. Using standard 20- or 30-round magazines will work but may require careful loading to avoid rim lock, and capacity will be reduced due to the cartridge’s diameter.

The flat-top upper receiver with a Picatinny rail allows for mounting a wide range of optics, from red dot sights for close-range work to low-power variable optics for hunting at moderate distances. The lack of included iron sights is intentional, as most users will mount a dedicated optic. The rail is continuous, providing ample space for forward-mounted accessories like lights or lasers if needed for home defense applications. The hardcoat anodized finish on both receivers is durable and resistant to corrosion, suitable for field use in various weather conditions.

The included ammunition from Alexander Arms is typically loaded with a 300-grain to 335-grain projectile at velocities around 1,800 to 2,000 feet per second. This combination delivers energy levels comparable to many .45-70 Government loads, but in a semi-automatic platform with a 10-round magazine capacity. The ammunition is loaded to SAAMI specifications, ensuring consistent performance and pressure levels. Having ammunition included with the rifle allows the buyer to test function immediately without sourcing specialty rounds, which can sometimes be harder to find than common calibers.

The overall weight of approximately 8.5 to 9 pounds, combined with the collapsible stock, makes this rifle manageable for most adult shooters, though the recoil is noticeable. The heavy barrel and the mass of the rifle help dampen the rearward impulse, but shooters should expect a push rather than a sharp snap. The A2-style flash hider provides some muzzle rise control, but aftermarket compensators can further reduce felt recoil for those who plan to shoot this rifle frequently. This is a rifle that rewards proper stance and technique.

Ideal Use Cases

• Hunting: Suitable for medium to large game such as wild boar, black bear, and white-tailed deer, particularly in states with straight-wall cartridge regulations. The .50 Beowulf’s energy transfer at 100 to 200 yards is effective for ethical kills.
• Home Defense: The 16-inch barrel and collapsible stock allow for maneuverability indoors. The .50 Beowulf’s heavy bullet is less likely to over-penetrate through multiple walls compared to high-velocity rifle rounds, though it will still penetrate barriers. Users should verify local laws regarding caliber restrictions for self-defense.
• Range Shooting: This rifle is an excellent choice for shooters who enjoy the challenge of managing significant recoil in a semi-automatic platform. It is a conversation piece at the range and provides a distinct shooting experience compared to standard AR-15 calibers.
• Collecting: Alexander Arms is the original manufacturer of the .50 Beowulf cartridge and this rifle, making it a notable piece for any collection focused on large-bore AR variants or unique calibers.

Compatibility Notes

• Ammunition: This rifle is designed for SAAMI-spec .50 Beowulf ammunition. Do not use reloaded ammunition unless you are certain of the load data. Using .500 S&W or other .50-caliber rounds is not safe. The included ammunition is factory-loaded by Alexander Arms or a licensed manufacturer.
• Magazines: Standard AR-15 magazines will work but are best used with a dedicated .50 Beowulf follower to prevent rim lock. A 7-round magazine is typically included. For higher capacity, 10-round magazines designed for .458 SOCOM or .50 Beowulf are available from aftermarket sources.
• Holsters: This is a rifle, not a handgun. No holster is applicable. For storage, a soft case or hard case is recommended.
• Accessories: The Picatinny rail accepts any standard scope rings or mounts. Muzzle devices with 5/8×24 threading are compatible, including suppressors (with appropriate NFA paperwork). The lower receiver accepts all mil-spec AR-15 parts, including triggers, grips, and stocks.
• Upper Receiver: The upper is specific to .50 Beowulf and cannot be swapped to a standard 5.56mm barrel without changing the bolt and ejection port. It is not a multi-caliber upper.

FAQ

• Q: Can this rifle be shipped to my address in the United States?
  A: Yes, we ship to all 50 states where the purchase of a .50 Beowulf rifle is legal. However, we must ship to a Federal Firearms License (FFL) holder in your state, not directly to your residence. You will need to arrange with a local FFL dealer to receive the transfer.
• Q: What is the FFL transfer process?
  A: After your purchase, we will contact you to obtain the FFL information for your chosen dealer. We ship the rifle via a common carrier (typically UPS or FedEx) to that dealer. You then visit the dealer, complete a Form 4473, and pass a background check. The dealer may charge a transfer fee, which is separate from our price. We only ship to licensed FFL holders.
• Q: Is the included ammunition compatible with this specific rifle?
  A: Yes, the ammunition included with this listing is factory-loaded .50 Beowulf, manufactured to SAAMI specifications. It is the same ammunition Alexander Arms uses for function testing. Do not attempt to use reloaded ammunition or ammunition from unknown sources without verifying headspace and pressure.
• Q: What warranty does Alexander Arms provide?
  A: Alexander Arms offers a limited lifetime warranty to the original owner against defects in materials and workmanship. This warranty covers the receiver and barrel assembly. It does not cover wear items like springs, extractors, or finishes, nor does it cover damage from improper maintenance, reloaded ammunition, or aftermarket modifications. You must retain your original purchase receipt.
• Q: What is your return policy for this rifle?
  A: Due to federal regulations and the nature of firearm sales, we cannot accept returns on new firearms unless there is a manufacturer defect. If you experience a functional issue, we will work with you and Alexander Arms to facilitate a warranty repair or replacement. If the rifle is shipped in error (wrong model, damaged in transit), we will arrange a return and exchange. You must