AR15 16" Upper Receiver | .22 Magnum WMR | Right Side Charger

AR15 16" Upper Receiver | .22 Magnum WMR | Right Side Charger

SKU: AR15-16-UPPER-RECEIVER-2-10125794
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Price $296.12

Bear Creek Arsenal BC-22 — AR-15 .22 Magnum (WMR) Complete Upper Receiver with Right Side Charger

The Bear Creek Arsenal BC-22 is a complete AR-15 upper assembly chambered in .22 Winchester Magnum Rimfire (.22 WMR / .22 Magnum). It drops onto any mil-spec AR-15 lower with an unnotched (rounded) hammer, giving AR owners access to the .22 Magnum cartridge's increased velocity and energy over .22 LR without a dedicated rifle. The 16-inch parkerized heavy barrel, blowback operating system, and included Gen 2 right-side charging handle make this a purpose-built .22 WMR upper, not a conversion kit.

Specifications

  • Caliber: .22 Magnum (WMR / .22 Winchester Magnum Rimfire)
  • Barrel length: 16 inches
  • Barrel profile: Heavy barrel
  • Barrel finish: Parkerized
  • Twist rate: 1:16
  • Gas system: Blowback (straight blowback, no gas tube or piston)
  • Thread pitch: 1/2x28
  • Handguard: 15-inch M-LOK split rail
  • Upper receiver: M4 flat-top billet aluminum
  • Charging handle: Gen 2 right-side charging handle (patent protected)
  • Muzzle device: Flash hider included
  • Included: Bolt carrier group, right-side charging handle, flash hider, carbine buffer, and buffer spring
  • Not included: Magazine, lower receiver
  • Lower compatibility: Mil-spec AR-15 lower with unnotched (rounded) hammer only

Operating System

The BC-22 uses a straight blowback operating system rather than the direct impingement or piston gas systems found on centerfire AR-15 uppers. Blowback is the standard operating method for rimfire AR-style uppers because .22 WMR is a rimfire cartridge and cannot be reliably fired with a firing pin and gas system designed for centerfire ammunition. The blowback system cycles the bolt carrier using chamber pressure alone, without a gas tube, gas block, or piston. This simplifies the design and reduces maintenance points, but it also means the upper must be used with the specific buffer and buffer spring included in the kit — standard AR-15 buffer weights are not compatible and will cause cycling failures.

Right-Side Charging Handle

The Gen 2 right-side charging handle replaces the traditional rear-positioned T-handle with a side-mounted charging handle on the right side of the upper receiver. This moves the charging action closer to the shooter's dominant hand on a standard right-handed shooter, eliminating the reach required to grasp the rear charging handle while keeping the rifle shouldered. The Gen 2 design is patent-protected and has an updated geometry over the original Gen 1 side charger. Note that the standard AR-15 dust cover and forward assist are not functional on this upper due to the right-side charging configuration.

Lower Compatibility and Hammer Requirement

This upper is compatible with any mil-spec AR-15 lower receiver, but the lower's hammer must be unnotched — meaning a rounded hammer face, not the standard notched centerfire AR hammer. Most .22 LR conversion lowers ship with an unnotched hammer, and dedicated .22 WMR AR lowers include the correct hammer. If you are using a standard AR-15 lower built for centerfire calibers, the existing notched hammer will need to be replaced with an unnotched (rounded) hammer before this upper will function correctly.

If you are building a dedicated .22 WMR AR rather than swapping onto an existing lower, a complete lower configured specifically for .22 WMR is the most reliable approach since all components will be matched from the start.

Magazine Note

Magazines are not included with this upper. The BC-22 requires .22 WMR-specific magazines designed for AR-style .22 Magnum uppers. Standard AR-15 magazines in 5.56, .223, or other centerfire calibers are not compatible. If using this upper on a mil-spec AR-style lower that was originally built for centerfire calibers, a special magazine adapter is also required to allow .22 WMR magazines to seat correctly. A dedicated .22 WMR AR lower eliminates the need for an adapter.

Buffer and Spring Requirement

The carbine-length buffer and buffer spring included with this upper are tuned specifically for the blowback operating system and the .22 WMR cartridge's pressure curve. Do not substitute a different buffer or spring. Running a heavier centerfire AR-15 buffer will result in short-cycling failures. Running a lighter buffer can cause over-cycling and potential damage. Use only the included buffer and spring with this upper.

Frequently Asked Questions

  • What is .22 Magnum (WMR) and how does it differ from .22 LR?

    .22 Winchester Magnum Rimfire (.22 WMR / .22 Magnum) is a rimfire cartridge that is physically larger and significantly more powerful than .22 Long Rifle. .22 WMR produces approximately 50% more muzzle energy than .22 LR at typical velocities, with a flatter trajectory and effective range extending well past 100 yards for varmint and small game work. The two cartridges are not interchangeable — a .22 WMR chamber cannot safely fire .22 LR, and a .22 LR chamber should not fire .22 WMR. This upper is chambered exclusively in .22 WMR and requires .22 WMR ammunition only.

  • Will this upper work on any AR-15 lower?

    It will work on any mil-spec AR-15 lower, but only if that lower has an unnotched (rounded) hammer. Standard centerfire AR-15 lowers use a notched hammer designed to interface with a firing pin for centerfire primers. The BC-22 requires a rounded hammer face that strikes the rimfire cartridge's rim rather than a centerfire primer. If your existing lower has a notched centerfire hammer, replace it with an unnotched hammer before installing this upper. A dedicated .22 WMR AR lower is the cleanest solution for a permanent build.

  • Does the blowback system require a gas tube or piston?

    No. The blowback system has no gas tube, gas block, or piston. Chamber pressure drives the bolt carrier rearward directly, without tapping gas from the barrel. This simplifies the design and eliminates the gas system as a maintenance and troubleshooting point, but it requires the specific buffer and spring included with the upper to cycle correctly. Do not attempt to install this upper on a lower with a pistol-length or rifle-length buffer tube — it is designed for a carbine-length buffer tube with the included hardware.

  • Can I use my existing AR-15 buffer and spring?

    No. The included carbine buffer and spring are tuned to the blowback system and .22 WMR pressure curve. Substituting a standard centerfire AR-15 buffer — which is heavier — will cause the bolt carrier to cycle too slowly, resulting in failures to feed or eject. The included buffer and spring must be used for the upper to cycle reliably.

  • What magazines does this upper use?

    This upper requires .22 WMR-specific magazines designed for AR-style .22 Magnum uppers. Standard AR-15 magazines in 5.56, .223, or any centerfire caliber are not compatible. If you are running this upper on a mil-spec lower originally built for centerfire use, you will also need a magazine adapter to allow .22 WMR magazines to seat and feed correctly in the lower's magazine well. A dedicated .22 WMR AR lower eliminates the adapter requirement.

  • How does the right-side charging handle work?

    The Gen 2 right-side charging handle is mounted on the right side of the upper receiver rather than at the rear in the standard AR-15 position. For a right-handed shooter, this allows the charging action to be completed with the right hand without removing the rifle from the shoulder or reaching back to the rear of the receiver. The handle is patent protected. Because the ejection port and charging handle configuration differ from a standard AR-15, the standard dust cover and forward assist are not present or functional on this upper.

  • What is the 1:16 twist rate optimized for?

    The 1:16 twist rate is slower than the 1:7 to 1:9 twist typically used in 5.56/.223 AR-15 barrels and is matched to the lighter .22 WMR projectiles, which typically range from 30 to 50 grains. A faster twist rate would over-stabilize these lightweight bullets and degrade accuracy. The 1:16 twist is the industry standard for .22 WMR barrels and is consistent across Bear Creek Arsenal's BC-22 lineup regardless of barrel length or finish.

  • What is the effective range of .22 WMR from a 16-inch barrel?

    From a 16-inch rifle barrel, .22 WMR delivers velocities between approximately 1,900 and 2,200 feet per second depending on the specific load, which gives it a practical accuracy range of around 100 to 150 yards for varmint-sized targets. Heavier loads in the 45 to 50 grain range retain energy better at distance, while lighter loads in the 30 grain range are optimized for maximum velocity and flat trajectory at shorter ranges. The cartridge is well suited for squirrel, rabbit, groundhog, and other small game at distances where .22 LR starts to lose effectiveness.

  • Does this upper require any tools to install on a lower?

    No special tools are required. The upper receiver attaches to any mil-spec AR-15 lower using the standard two takedown pins. Verify that the lower's hammer is unnotched before installing the upper, and install the included buffer and spring in the lower's buffer tube before assembling. The upper ships with the BCG, charging handle, and flash hider already installed, so no assembly of the upper itself is needed before mounting.

  • Is an FFL required to purchase this upper?

    No FFL is required. A complete upper receiver is not classified as a firearm under federal law and ships directly to your door without an FFL transfer. The serialized component of an AR-style rifle is the lower receiver, not the upper. This upper can be ordered online and shipped directly to you in most states. Verify your state's laws regarding .22 WMR and rimfire-specific regulations before ordering if you have any compliance questions.

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