2021 DEC update: We have converted all HAO PTW receivers to adopt the new PTW Infinity gear box and motor. It's now Value kit (Kumi motor) and Infinity kit both compatible. Now the kit you order will come with the RS spec grip adaptor. 
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HAO's 416CAG conversion kits for SYSTEMA PTW are CNC machined from an Alloy 7075-T6 billet which is as same material as real firearm.
HAO's 416CAG conversion kit is not only anodized the set in Desert Dirt Colour , but also add the most iconic item in this pack;
Super Modular Rail for HK416 in DDC, SFCT muzzle brake, HK416 OTB buffer tube(MIL-issued) in RAL8000 Mil-Spec III hardcoat anodizing, DDC ambi-Charging handle with HAO's charging handle recoil system, RAL8000 V7 grip specifically design for PTW system.
 
HAO make PTW great again!!And don't forgot we also have Value kit 3 available!!*
 
Disclaimer: Due to the nature of the anodising process and the dye used, HAO's 416CAG set can look green or brown - or shades in between - depending on light conditions, flash photography or monitor used.
 
Term Of Use:All products sold by HAO are intended for Airsoft use only. Other uses are prohibited. Any modification including painting, marking or wiping the cover/instruction stickers is prohibited, and may be a violation of law. Customers assume full legal liability for any modifications they perform, absolving HAO of any responsibility.