The SIG Sauer Elite Performance .300 AAC Blackout 120-grain SBR Solid Copper Brass 20-round box is a specialized centerfire rifle cartridge engineered specifically for compact short-barreled rifles (SBRs) and pistol-caliber AR platforms in defensive scenarios. A primary friction point when firing standard .300 BLK ammunition out of barrels shorter than 9 inches is unburnt powder, extreme muzzle flash, and significant velocity loss, which degrades terminal bullet expansion and blinds the shooter in low-light environments. SIG Sauer resolves these short-barrel limitations by utilizing fast-burning propellants and a specialized solid copper projectile optimized for complete powder burn and maximum velocity in barrels as short as 6.75 inches.
The primary technical advantage centers on the monolithic solid copper hollow point paired with tuned internal ballistics. Built from 100% solid copper, the projectile eliminates core-jacket separation, maintaining mass to drive through intermediate barriers like drywall and glass without fragmenting. Upon impact, the deep hollow point cavity initiates controlled expansion up to 1.8 times its original diameter even at reduced SBR impact velocities, while the specialized fast-burning propellant formulation drastically suppresses muzzle flash and smoke output.
Firing out of a compact 6.75-inch SBR barrel, the 120-grain solid copper bullet exits at 1,897 FPS and generates 959 ft-lbs of muzzle energy, delivering full-power terminal performance out of ultra-compact platforms. Assembled using precision-drawn reloadable virgin brass cases, clean-burning powders, and non-corrosive Boxer primers, it ensures uniform neck tension, smooth feed-ramp transition, and reliable semi-automatic cycling in standard AR-pattern magazines. It is a premier selection for home defense, tactical duty, and compact SBR weapon systems.
Key Benefits
- Short Barrel Rifle (SBR) Optimized Powder: Fast-burning propellant ensures full combustion in barrels down to 6.75 inches to maximize velocity and suppress flash.
- Monolithic Solid Copper Hollow Point: Maintains 100% weight retention through intermediate barriers while achieving up to 1.8x controlled expansion.
- Low-Flash Defensive Formulation: Preserves night vision and shooter visibility during close-quarters or low-light defensive engagements.
- Precision Reloadable Virgin Brass: High-grade brass cases ensure smooth feeding, uniform chamber sealing, and long reloadable life.
Technical Specification
- Ballistics: .300 AAC Blackout / .300 BLK | 1,897 FPS Muzzle Velocity (6.75" SBR Barrel) | 959 Ft-Lbs Muzzle Energy
- Projectile: 120 Grain | Monolithic Solid Copper | Hollow Point (HP) | Lead-Free Design | Barrier-Blind
- Case/Primer: Precision-Drawn Virgin Reloadable Brass Case | Non-Corrosive Boxer Primed
- Logistics: 20 Rounds Per Box | SIG Sauer Elite Performance Series
- Dimensions: Standard .300 BLK Geometry | AR-15 & SBR Platform Compatible | SKU: E300H1SBR20
- Application: Short Barrel Rifles (SBR), AR-15 Pistols, Home Defense, Tactical Duty, and Barrier-Blind Defense
- Standards: SAAMI Compliant | SIG Sauer Factory Quality Control Benchmarks
When short-barrel efficiency and terminal consistency matter, this cartridge delivers predictable results across defensive and field applications. Trust Smoky Mountain Knife Works to supply duty-grade ammunition backed by consistent inventory and verified specifications.
