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.