SIX8 SPR Uppers
Price: $1,958.00


The LWRCI™  SIX8™ SPR | Special Purpose Rifle Upper Receiver is constructed using the highest quality materials.  Built on our patented self-regulating short-stroke gas piston system, machined from materials that belong to the superalloy family of steel alloys most often used in aerospace, LWRCI™  raises the bar on reliability and ease of maintenance- delivering the highest level of performance.

SIX8™ SPR Uppers with LWRCI Monoforge design includes an integrated rail-base that is stronger and lighter.  The 12”  user configurable rail system with individual rail sections allow the shooter to place accessory rails where they are needed while maintaining its low profile ergonomic fit and function. 

Our SIX8™ SPR Uppers proprietary design has been optimized for the 6.8 SPC II cartridge. The one-piece LWRCI™  Advanced Combat Bolt in 6.8 features a fully supported bolt face, dual extractor springs, the ‘Claw’ extractor provides 20% more purchase on the case rim for positive extraction every time, a bolt face groove rto collect dirt and brass shaving, and a Nickel Boron coating for wear resistance and permanent lubricity.

Our SIX8™ SPR Upper uses LWRCI™ manufactured- NiCorr treated cold Hammer Forged heavy barrel. Nickel-boron coated bolt carrier delivers unparalleled wear resistance, corrosion resistance and permanent lubricity. 

The LWRCI™ Gas-piston system can be accessed quickly by loosening two thumb screws and removing the top rail section. SIX8™ SPR Uppers also include an LWRCI™ High Efficiency 4 Prong Flash Hider. 

For the 14.7” Models- LWRCI™ High Efficiency Flash Hiders are PERMANENTLY ATTACHED.

    Product Features

  • Proprietary LWRCI™ 6.8 SPC Upper design with integrated rail base
  • LWRCI™ Nicorr Treated Cold-Hammer Forged Heavy Barrel
  • LWRCI™ Full Length Picatinny Top Rail
  • 12” User Configurable rail system
  • Patented LWRCI™ Short Stroke Gas Piston System
  • ACB- Advanced Combat Bolt in 6.8- Nickel-Boron coated bolt carrier
  • LWRCI™ High Efficiency Flash Hider
  • Caliber: 6.8 SPC II
  • Barrel Length: 14.7” | 37.3 cm 16.1 | 40.9cm
  • Weight: 5.0 lbs (2.2 kg)
  • Muzzle Threads: 5/8 X 24 TPI
  • Rifling:Rifling: 1/10”RH
  • LWRCI™ manufactured barrel is precisely torqued in our factory to a consistent torque setting, cold hammer forged- Nicorr treated with a 1:10 RH twist stabilizes a wide range of bullet types
  • All LWRCI™ forgings are coined: the material is struck twice in the die for precise dimensional accuracy and a superior surface finish
  • LWRCI™ applies its own Cerakote: ceramic-based thermoset epoxy finish in 3 color selections

    Patriot Brown
    OD Green
    Flat Dark Earth
    Black Anodized

Available Models

WARNING: Observe safe firearm handling practices at all times. Failure to do so may result in serious bodily injury or death. LWRC International shall not be responsible for injury, death, or property damage resulting from faulty installation, misuse, illegal use, or modification of this product.

EXPORT NOTICE: This product and/or its components is subject to the International Traffic in Arms Regulations (ITAR, 22 CFR Parts 120-130) and export is strictly prohibited without authorization or a license issued by the U.S. Department of State's Directorate of Defense Trade Controls. Additionally, any documents or engineering drawings, prints, etc. that can be viewed, downloaded, or printed from our Web site may contain technical data which may not be Exported outside of the United States, or released or disclosed to non-US persons (i.e. persons who are not US citizens or lawful permanent residents) inside of the United States, without prior written authorization by the relevant US Government agency.Violations of these export laws are subject to severe civil, criminal and administrative penalties.