Black Rain Ordnance SPEC15, 5.56mm, 10.5" Barrel, 15" Handguard OCL Polonium 556 Complete Upper

697067883068-Black Rain Ordnance SPEC15, 5.56mm, 10.5" Barrel, 15" Handguard, Suppressor Ready Complete Upper Receiver

664533654132-Otter Creek Labs Polonium 5.56 Duty Suppressor

Pairing a Black Rain suppressor-ready upper with the proven durability of the Polonium makes this bundle a turnkey solution for shooters who demand outstanding suppressed performance, rugged reliability, and tactical efficiency. Built for users who run their gear hard—whether in home defense roles, professional environments, or custom-duty builds—this combination delivers seamless compatibility and exceptional suppression in a compact, maneuverable package.

The Black Rain 10.5" complete upper is purpose-engineered for suppressed use, featuring a stainless steel 1:7" barrel, nickel-boron BCG, and a 15" hybrid M-Lok handguard that allows up to 5.4" of the Polonium to nest inside while accommodating its 1.90" diameter. The result is a streamlined, low-profile setup with excellent balance and reduced overall signature.

Matched with the Polonium—one of the most respected hard-use 5.56 suppressors on the market—you get a duty-rated can optimized for real performance, not inflated marketing claims. Its 6mm bore also accepts 6mm/.243 cartridges, while the built-in internal and external flash hider dramatically reduces flash under night vision or low-light conditions. Extensive external weight-reduction machining increases surface area by up to 10%, helping the suppressor shed heat faster while remaining exceptionally strong.

Together, this bundle gives builders and tactical shooters a complete suppressed solution that excels under pressure, handles intense firing schedules, and maintains the accuracy, reliability, and flash control demanded in critical situations. A powerful pairing—ready for immediate deployment on your next precision build.

Specifications

• Action: Direct Impingement Complete Upper

• Barrel: 10.5" Stainless Steel, 1:7" Twist, 1/2"x28 TPI

• Handguard: 15" Hybrid M-Lok

• BCG: Nickel-Boron Coated

• Suppressor Compatibility: Accepts suppressors up to 1.90" diameter with 5.4" nested inside handguard

• Suppressor Model: Polonium (Hard-Use Duty-Rated)

• Caliber Compatibility (Suppressor): 5.56 with 6mm/.243 capable bore

• Features (Suppressor): Integrated internal/external flash hider, increased cooling surface area, precision weight-reduction machining

Equip your rifle with a battle-proven suppressor and a purpose-built upper—only at BattleHawk Armory.