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The Diablo Upper is Primary Weapons Systemsï¾’ answer to the 7ï¾” AR-15/M-16 series upper. Rather than simply bolting on an existing product and calling it revolutionary, PWS stepped back and designed a system from the ground up to work specifically with the extreme pressures of the 7ï¾” barrels. We started with the barrel and after careful research decided on a 7ï¾” (not 7.5ï¾”) stainless steel polygonal bore barrel with a 1:8 twist. A match bolt carrier assembly is housed inside of a MUR-1 (mil-spec) upper receiver with a billet machined charging handle. Low profile quad rails give the most possible room for accessories and XTM rail covers. The Diablo upper utilizes a long stroke piston system for additional dwell time and smooth recoil. The system is rounded out with the new CQB comp from PWS - a comp designed for short barrels that compensates, suppresses flash and directs all the blast forward.

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The Diablo Upper is Primary Weapons Systemsï¾’ answer to the 7ï¾” AR-15/M-16 series upper. Rather than simply bolting on an existing product and calling it revolutionary, PWS stepped back and designed a system from the ground up to work specifically with the extreme pressures of the 7ï¾” barrels. We started with the barrel and after careful research decided on a 7ï¾” (not 7.5ï¾”) stainless steel polygonal bore barrel with a 1:8 twist. A match bolt carrier assembly is housed inside of a MUR-1 (mil-spec) upper receiver with a billet machined charging handle. Low profile quad rails give the most possible room for accessories and XTM rail covers. The Diablo upper utilizes a long stroke piston system for additional dwell time and smooth recoil. The system is rounded out with the new CQB comp from PWS - a comp designed for short barrels that compensates, suppresses flash and directs all the blast forward.

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In 1989, Arumugam Manthiram and John Goodenough of the University of Texas at Austin showed that cathodes containing polyanions, eg. sulfates, produce higher voltage than oxides due to the inductive effect of the polyanion.[10] Following this, in 1996 Goodenough and co-workers discovered the electrochemical utility of the olivine material lithium iron phosphate, LiFePO4. It is an important and emerging cathode material for lithium-ion batteries due in part to its enhanced safety compared to other lithium-ion chemistries. Cells containing lithium iron phosphate cathodes have been commercialised by multiple companies, including Phostech, Valence Technology, A123Systems, Aleees and Lithium Technology Corp.* [Information from Wikipedia]

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In 1989, Arumugam Manthiram and John Goodenough of the University of Texas at Austin showed that cathodes containing polyanions, eg. sulfates, produce higher voltage than oxides due to the inductive effect of the polyanion.[10] Following this, in 1996 Goodenough and co-workers discovered the electrochemical utility of the olivine material lithium iron phosphate, LiFePO4. It is an important and emerging cathode material for lithium-ion batteries due in part to its enhanced safety compared to other lithium-ion chemistries. Cells containing lithium iron phosphate cathodes have been commercialised by multiple companies, including Phostech, Valence Technology, A123Systems, Aleees and Lithium Technology Corp.* [Information from Wikipedia]

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Airsoft M4 AR Metal receiver (Fullly licensed trademark) NOVESEK N4 5.56 Features: 3D design from scratch (not just copy others) T6 Aluminum material Authentic trademark Deep "CNC" trademark engraving (Not cheap laser engraving) One world famous MadBull Ultimate Hopup ($40 USD value) with optional LED tracer function Matte silver steel color pins (decorative) Compatible with most TM, JG, CA, and Echo1 AR/ M4. (Small modification may needed) Compatible with all MadBull accessories, including Handguard rails, Outter barrels, Hopup systems, Inner barrels, and receivers. MSRP: $99 USD Manual: Click here Review: First impression review by Arnies: http://arniesairsoft.co.uk/news2/9635 Learn More