HAO represents you the HAO L119A2 Monolithic (IUR) full kit for GHK. 
True monolithic upper receiver with handguard for your PTW, made with 7075-T6. Tough and slim. This time we bring you the very correct L119A2 type lower. Every detail is made for true SAS lovers. 
 
HAO's L119A2 IUR upper kits for GHK are CNC machined from an Alloy 7075-T6 billet which is the same material as real firearm. You will have 10" one piece steel gundrilled barrel end with 1/2-28RH thread , CNC machined L119A2 style gasblock, Full RS spec steel made barrel nut, Hydraulic pressed heat shield, etc.,
 
The Lower receiver is also machined inhouse with the Alloy7075 , high precision, andlow tolerance.
 
You may also purchase L119A2's accessories as following links:
Barrel nut tool:
https://www.haoptwart.com/product-page/l119a2-monolithic-barrel-nut-tool
Charging handle:
https://www.haoptwart.com/product-page/l119a2-style-charging-handle
Charging handle latch:
https://www.haoptwart.com/product-page/l119a2-charging-handle-s-latch
Heat shield:
https://www.haoptwart.com/product-page/hao-s-l119a2-heatshield
Gas block & Gas pipe:
https://www.haoptwart.com/product-page/hao-l119a2-gasblock-with-piston-tube
 
Anodizing/surface treatment disclaimer :
Anodizing is a serious chemical process that is fairly unstable. The shade of color can vary batch by batch. We do our best to make the color as correct as possible but we can NOT generate if the shade meets your imagination. Also to be noted that every monitor has its color differences. The color of the object and the color on your computer/ mobile device may be different. 
 
Made in Taiwan
BB type: 6mm 0.2g BBs
Power source: 11.1V PTW, AEG / 9KG green gas GBBR
Power: 90 m/s = 0.81J with 0.2g BBs
J / cm2:  2.835 J/cm2
Design and manufacture for Airsoft use. No live ammunition using function.